Einstein Activity Capture events not syncing after migrating from Microsoft 365 EWS to Microsoft Graph

Hello community,

We recently migrated our Einstein Activity Capture integration from Microsoft 365 EWS to Microsoft Graph.

After the migration:

• Emails are syncing correctly again.
• Users appear connected through Microsoft Graph.
• Initial synchronization completed successfully.
• Event synchronization is configured in both directions.
• We even created a brand-new EAC configuration to avoid any legacy EWS-related issues.

However, calendar events are still not syncing correctly:

• Events created from Salesforce do not appear in Outlook.
• Meeting invitations are not sent to attendees.
• Events created in Outlook are also not being reflected in Salesforce.

We already performed:

• user reconnection,
• resynchronization,
• event reset,
• creation of a new EAC configuration,
• and validation that the initial sync completed successfully.

At this point, it seems the issue may be related to Microsoft Graph/Azure permissions or write-back calendar permissions.

Has anyone experienced something similar after migrating from EWS to Microsoft Graph?  Did you need to adjust specific Azure permissions (such as Calendars.ReadWrite or Admin Consent) or perform any additional steps to restore bidirectional calendar sync?

Any guidance or shared experience would be greatly appreciated.

@* Sales Cloud - Getting Started *