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1 | 1 | --- |
2 | | -title: IncomingEmailS2SApprovalNeeded when you install Dynamics 365 App for Outlook |
3 | | -description: This article provides a resolution for the problem that occurs when you attempt to install Dynamics 365 App for Outlook, the Status column shows Issue when adding to Outlook. |
| 2 | +title: IncomingEmailS2SApprovalNeeded or IncomingEmailRejected when installing Dynamics 365 App for Outlook |
| 3 | +description: Solves errors that occur when you try to install Microsoft Dynamics 365 App for Outlook. |
4 | 4 | ms.reviewer: |
5 | | -ms.topic: troubleshooting |
6 | | -ms.date: 03/31/2021 |
| 5 | +ms.date: 03/12/2025 |
7 | 6 | ms.custom: sap:Dynamics 365 App for Outlook Add-In |
8 | 7 | --- |
9 | | -# IncomingEmailS2SApprovalNeeded error when attempting to install Dynamics 365 App for Outlook |
| 8 | +# IncomingEmailS2SApprovalNeeded or IncomingEmailRejected error when you install Dynamics 365 App for Outlook |
10 | 9 |
|
11 | | -This article helps you resolve the problem that occurs when you attempt to install Dynamics 365 App for Outlook, the Status column shows **Issue when adding to Outlook**. |
| 10 | +This article helps you resolve errors that might occur when you try to install Microsoft Dynamics 365 App for Outlook. |
12 | 11 |
|
13 | 12 | _Applies to:_ Dynamics 365 App for Outlook |
14 | | -_Original KB number:_ 3211621 |
| 13 | +_Original KB number:_ 3211621, 3211627 |
15 | 14 |
|
16 | | -## Symptoms |
| 15 | +## Error: IncomingEmailS2SApprovalNeeded |
17 | 16 |
|
18 | | -When you attempt to install Dynamics 365 App for Outlook, the Status column shows **Issue when adding to Outlook**. When you click the **Learn more** link, you see a dialog with the following details: |
| 17 | +When you try to [install Dynamics 365 App for Outlook](/dynamics365/outlook-app/deploy-dynamics-365-app-for-outlook), the **Status** column shows **Issue when adding to Outlook**. When you select the **Learn more** link, you see a dialog with the following details: |
19 | 18 |
|
20 | 19 | > There was an issue when attempting to add the app to Outlook. |
21 | | -Crm : IncomingEmailS2SApprovalNeeded |
| 20 | +> Crm : IncomingEmailS2SApprovalNeeded |
22 | 21 |
|
23 | | -## Cause |
| 22 | +### Cause |
24 | 23 |
|
25 | | -This error can occur if the Mailbox record has not been approved by an Office 365 Global Administrator. |
| 24 | +This error can occur if the mailbox record isn't approved by a Microsoft 365 Global Administrator. |
26 | 25 |
|
27 | | -## Resolution |
| 26 | +### Resolution |
28 | 27 |
|
29 | | -Approve the Mailbox record as a user with the Global Administrator role in Office 365. |
| 28 | +To solve this issue, approve the mailbox record as a user with the Global Administrator role in Microsoft 365. |
30 | 29 |
|
31 | | -1. Sign in to Dynamics 365 as a user with the Global Administrator role in Office 365. |
32 | | -2. Click **Settings** and then click **Email Configuration**. |
33 | | -3. Within the **Email Configuration** area, click **Mailboxes** and then change the view from **My Active Mailboxes** to **Active Mailboxes**. |
34 | | -4. Select the Mailbox record that encountered the error and then click **Approve Email**. |
35 | | -5. After the email address has been approved, click the **Test & Enable Mailboxes** button. |
36 | | -6. After the mailbox has completed testing, attempt to install Dynamics 365 App for Outlook again. This can be located by clicking **Settings** and then clicking Dynamics 365 App for Outlook. |
| 30 | +1. Sign in to Dynamics 365 as a user with the Global Administrator role in Microsoft 365. |
| 31 | +2. Select **Settings** > **Email Configuration**. |
| 32 | + |
| 33 | +3. Within the **Email Configuration** area, select **Mailboxes**, and then change the view from **My Active Mailboxes** to **Active Mailboxes**. |
| 34 | + |
| 35 | +4. Select the mailbox record that encountered the error, and then select **Approve Email**. |
| 36 | +5. After the email address is approved, select the **Test & Enable Mailboxes** button. |
| 37 | + |
| 38 | +6. After the mailbox has completed testing, try to install Dynamics 365 App for Outlook again. This can be located by selecting **Settings** > **Dynamics 365 App for Outlook**. |
| 39 | + |
| 40 | +## Error: IncomingEmailRejected |
| 41 | + |
| 42 | +When you try to install Dynamics 365 App for Outlook, the **Status** column shows **Issue when adding to Outlook**. When you select the **Learn more** link, you see a dialog with the following details: |
| 43 | + |
| 44 | +> There was an issue when attempting to add the app to Outlook. |
| 45 | +> Crm : IncomingEmailRejected |
| 46 | +
|
| 47 | +### Cause |
| 48 | + |
| 49 | +This error can occur due to one of the following reasons: |
| 50 | + |
| 51 | +- The email address for the mailbox record in Dynamics 365 isn't approved. |
| 52 | +- The Exchange mailbox is currently linked to another Dynamics 365 organization. An Exchange mailbox (email address) can only synchronize appointments, contacts, and tasks with one organization, and a user that belongs to that organization can only synchronize appointments, contacts, and tasks with one Exchange mailbox. |
| 53 | + |
| 54 | +### Resolution |
| 55 | + |
| 56 | +Verify the email address for the mailbox is approved and associated with the desired Dynamics 365 organization. |
| 57 | + |
| 58 | +1. Sign in to Dynamics 365 as a user with the System Administrator role. |
| 59 | +2. Select **Settings** > **Email Configuration**. |
| 60 | + |
| 61 | +3. Within the **Email Configuration** area, select **Mailboxes**, and then change the view from **My Active Mailboxes** to **Active Mailboxes**. |
| 62 | +4. Select the mailbox record that encountered the error, and then select **Approve Email**. |
| 63 | +5. After the email address is approved, select the **Test & Enable Mailboxes** button. |
| 64 | + |
| 65 | +6. Within the **Test Email Configuration** dialog, make sure to select the [Sync items with Exchange from this Dynamics 365 Organization only, even if Exchange was set to sync with a different Organization](/dynamics365/customerengagement/on-premises/admin/when-would-want-use-check-box) checkbox, and then select **OK**. |
| 66 | + |
| 67 | +7. After the mailbox has completed testing, try to install Dynamics 365 App for Outlook again. This can be located by selecting **Settings** > **Dynamics 365 App for Outlook**. |
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