[Bug] MSAL should use the recommended padding in client_credentials

[bgavrilMS]

Library version used

latest

Java version

8

Scenario

ConfidentialClient - service to service (AcquireTokenForClient)

Is this a new or an existing app?

This is a new app or experiment

Issue description and reproduction steps

The recommended padding is PSS, as per docs https://learn.microsoft.com/en-us/entra/identity-platform/certificate-credentials#header

MSAL Java use RSS -

microsoft-authentication-library-for-java/msal4j-sdk/src/main/java/com/microsoft/aad/msal4j/JwtHelper.java

Line 49 in b02c8f2

JWSHeader.Builder builder = new Builder(JWSAlgorithm.RS256);

Relevant code snippets

Expected behavior

No response

Identity provider

Microsoft Entra ID (Work and School accounts and Personal Microsoft accounts)

Regression

No response

Solution and workarounds

No response