Hey guys,

I'm having trouble getting Exchange Integration to work on a system running 2025 R2.1.

I did already install the patch  Updated Product Advisory: Exchange Online integration error and supported workaround versions published for 2025 R2.1. 

In CRM it says that the Exchange Connection was established successfully. But, after the first sychronization I see that none of the email inboxes could be synchronized. Protocol says

"Caused by: java.io.IOException: Server returned HTTP response code: 403 for URL: https://outlook.office365.com/EWS/Exchange.asmx"

EWS is enabled for the imboxes. In Entra ID the app registration is set up as well to include EWS rights. All API-rights are granted. App-registration is set up 1:1 as for other systems, so this should work.

Does anybody have an idea what else to check to fix the 403 error for https://outlook.office365.com/EWS/Exchange.asmx ?

Thanks