diff --git a/src/plus/integrations/providers/azure/azure.ts b/src/plus/integrations/providers/azure/azure.ts
index aa9d41255894f..29b8ae0b787c6 100644
--- a/src/plus/integrations/providers/azure/azure.ts
+++ b/src/plus/integrations/providers/azure/azure.ts
@@ -24,6 +24,7 @@ import { Logger } from '../../../../system/logger';
 import type { LogScope } from '../../../../system/logger.scope';
 import { getLogScope } from '../../../../system/logger.scope';
 import { maybeStopWatch } from '../../../../system/stopwatch';
+import { base64 } from '../../../../system/string';
 import type {
 	AzureProjectDescriptor,
 	AzurePullRequest,
@@ -334,7 +335,10 @@ export class AzureDevOpsApi implements Disposable {
 
 				rsp = await wrapForForcedInsecureSSL(provider.getIgnoreSSLErrors(), () =>
 					fetch(url, {
-						headers: { Authorization: `Bearer ${token}`, 'Content-Type': 'application/json' },
+						headers: {
+							Authorization: `Basic ${base64(`PAT:${token}`)}`,
+							'Content-Type': 'application/json',
+						},
 						agent: agent,
 						signal: aborter?.signal,
 						...options,
diff --git a/src/plus/integrations/providers/azureDevOps.ts b/src/plus/integrations/providers/azureDevOps.ts
index aca87bc1d33c4..2d14dc867b626 100644
--- a/src/plus/integrations/providers/azureDevOps.ts
+++ b/src/plus/integrations/providers/azureDevOps.ts
@@ -8,6 +8,7 @@ import type { IssueOrPullRequest } from '../../../git/models/issueOrPullRequest'
 import type { PullRequest, PullRequestMergeMethod, PullRequestState } from '../../../git/models/pullRequest';
 import type { RepositoryMetadata } from '../../../git/models/repositoryMetadata';
 import { getSettledValue } from '../../../system/promise';
+import { base64 } from '../../../system/string';
 import type { IntegrationAuthenticationProviderDescriptor } from '../authentication/integrationAuthenticationProvider';
 import { HostingIntegration } from '../integration';
 import type {
@@ -81,7 +82,10 @@ export class AzureDevOpsIntegration extends HostingIntegration<
 			const account = await this.getProviderCurrentAccount(session);
 			if (account?.id == null) return undefined;
 
-			const resources = await api.getAzureResourcesForUser(account.id, { accessToken: accessToken });
+			const resources = await api.getAzureResourcesForUser(account.id, {
+				accessToken: convertTokentoPAT(accessToken),
+				isPAT: true,
+			});
 			this._organizations.set(
 				accessToken,
 				resources != null ? resources.map(r => ({ ...r, key: r.id })) : undefined,
@@ -117,7 +121,10 @@ export class AzureDevOpsIntegration extends HostingIntegration<
 			const azureProjects = (
 				await Promise.allSettled(
 					resourcesWithoutProjects.map(resource =>
-						api.getAzureProjectsForResource(resource.name, { accessToken: accessToken }),
+						api.getAzureProjectsForResource(resource.name, {
+							accessToken: convertTokentoPAT(accessToken),
+							isPAT: true,
+						}),
 					),
 				)
 			)
@@ -164,7 +171,8 @@ export class AzureDevOpsIntegration extends HostingIntegration<
 			projects.map(async project => {
 				const repos = (
 					await api.getReposForAzureProject(project.resourceName, project.name, {
-						accessToken: accessToken,
+						accessToken: convertTokentoPAT(accessToken),
+						isPAT: true,
 					})
 				)?.values;
 				if (repos != null && repos.length > 0) {
@@ -202,7 +210,8 @@ export class AzureDevOpsIntegration extends HostingIntegration<
 		try {
 			const merged = await api.mergePullRequest(this.id, pr, {
 				...options,
-				accessToken: accessToken,
+				accessToken: convertTokentoPAT(accessToken),
+				isPAT: true,
 			});
 			return merged;
 		} catch (ex) {
@@ -306,8 +315,11 @@ export class AzureDevOpsIntegration extends HostingIntegration<
 		project: string;
 	}): Promise<ProviderRepository | undefined> {
 		const api = await this.getProvidersApi();
+		if (this._session == null) return undefined;
+
 		return api.getRepo(this.id, repo.owner, repo.name, repo.project, {
-			accessToken: this._session?.accessToken,
+			accessToken: convertTokentoPAT(this._session.accessToken),
+			isPAT: true,
 		});
 	}
 
@@ -347,13 +359,15 @@ export class AzureDevOpsIntegration extends HostingIntegration<
 		const projectInputs = projects.map(p => ({ namespace: p.resourceName, project: p.name }));
 		const assignedPrs = (
 			await api.getPullRequestsForAzureProjects(projectInputs, {
-				accessToken: session.accessToken,
+				accessToken: convertTokentoPAT(session.accessToken),
+				isPAT: true,
 				assigneeLogins: [user.username],
 			})
 		)?.map(pr => this.fromAzureProviderPullRequest(pr, repoDescriptors, projects));
 		const authoredPrs = (
 			await api.getPullRequestsForAzureProjects(projectInputs, {
-				accessToken: session.accessToken,
+				accessToken: convertTokentoPAT(session.accessToken),
+				isPAT: true,
 				authorLogin: user.username,
 			})
 		)?.map(pr => this.fromAzureProviderPullRequest(pr, repoDescriptors, projects));
@@ -392,7 +406,8 @@ export class AzureDevOpsIntegration extends HostingIntegration<
 				projects.map(async p => {
 					const issuesResponse = (
 						await api.getIssuesForAzureProject(p.resourceName, p.name, {
-							accessToken: session.accessToken,
+							accessToken: convertTokentoPAT(session.accessToken),
+							isPAT: true,
 							assigneeLogins: [user.username!],
 						})
 					).values;
@@ -547,3 +562,7 @@ const azureCloudDomainRegex = /^dev\.azure\.com$|\bvisualstudio\.com$/i;
 export function isAzureCloudDomain(domain: string | undefined): boolean {
 	return domain != null && azureCloudDomainRegex.test(domain);
 }
+
+function convertTokentoPAT(accessToken: string): string {
+	return base64(`PAT:${accessToken}`);
+}
diff --git a/src/plus/integrations/providers/providersApi.ts b/src/plus/integrations/providers/providersApi.ts
index 4272406b53013..8cc6b59170ca4 100644
--- a/src/plus/integrations/providers/providersApi.ts
+++ b/src/plus/integrations/providers/providersApi.ts
@@ -611,7 +611,7 @@ export class ProvidersApi {
 
 	async getAzureResourcesForUser(
 		userId: string,
-		options?: { accessToken?: string },
+		options?: { accessToken?: string; isPAT?: boolean },
 	): Promise<ProviderAzureResource[] | undefined> {
 		const { provider, token } = await this.ensureProviderTokenAndFunction(
 			HostingIntegrationId.AzureDevOps,
@@ -620,7 +620,9 @@ export class ProvidersApi {
 		);
 
 		try {
-			return (await provider.getAzureResourcesForUserFn?.({ userId: userId }, { token: token }))?.data;
+			return (
+				await provider.getAzureResourcesForUserFn?.({ userId: userId }, { token: token, isPAT: options?.isPAT })
+			)?.data;
 		} catch (e) {
 			return this.handleProviderError<ProviderAzureResource[] | undefined>(
 				HostingIntegrationId.AzureDevOps,
@@ -732,7 +734,7 @@ export class ProvidersApi {
 				provider.getAzureProjectsForResourceFn,
 				azureToken,
 				options?.cursor,
-				true,
+				options?.isPAT,
 			);
 		} catch (e) {
 			return this.handleProviderError<PagedResult<ProviderAzureProject>>(
@@ -746,7 +748,7 @@ export class ProvidersApi {
 	async getReposForAzureProject(
 		namespace: string,
 		project: string,
-		options?: GetReposOptions & { accessToken?: string },
+		options?: GetReposOptions & { accessToken?: string; isPAT?: boolean },
 	): Promise<PagedResult<ProviderRepository>> {
 		const { provider, token } = await this.ensureProviderTokenAndFunction(
 			HostingIntegrationId.AzureDevOps,
@@ -760,6 +762,7 @@ export class ProvidersApi {
 			provider.getReposForAzureProjectFn,
 			token,
 			options?.cursor,
+			options?.isPAT,
 		);
 	}
 
@@ -864,7 +867,7 @@ export class ProvidersApi {
 			return (
 				await provider.getPullRequestsForAzureProjectsFn?.(
 					{ projects: projects, ...options },
-					{ token: azureToken, isPAT: true },
+					{ token: azureToken, isPAT: options?.isPAT },
 				)
 			)?.data;
 		} catch (e) {
@@ -971,7 +974,7 @@ export class ProvidersApi {
 	async getIssuesForAzureProject(
 		namespace: string,
 		project: string,
-		options?: GetIssuesOptions & { accessToken?: string },
+		options?: GetIssuesOptions & { accessToken?: string; isPAT?: boolean },
 	): Promise<PagedResult<ProviderIssue>> {
 		const { provider, token } = await this.ensureProviderTokenAndFunction(
 			HostingIntegrationId.AzureDevOps,
@@ -985,6 +988,7 @@ export class ProvidersApi {
 			provider.getIssuesForAzureProjectFn,
 			token,
 			options?.cursor,
+			options?.isPAT,
 		);
 	}