Overview
When you try to import user data from Microsoft 365 into BulkSignature and the import fails with a backend error, the most common root cause is that the BulkSignature Email Signatures 365 enterprise application has been deleted (or its consent revoked) in the Microsoft Entra admin center.
Because BulkSignature relies on this registered application to authenticate and read directory data from your Microsoft 365 tenant, removing it breaks the integration. The good news: the issue is fully recoverable from inside BulkSignature — you do not need to restore anything manually in Entra.
Symptoms
You may see one or more of the following when this happens:
Clicking Import user data from MS365 returns a backend error instead of loading users/groups.
A Re-connect MS integration button appears on the import screen where the import action used to be.
Previously working imports suddenly stop working after an administrator cleanup in Entra (Azure AD) enterprise applications.
Root Cause
The BulkSignature Email Signatures 365 application was removed from Microsoft Entra admin center → Enterprise applications. Once the app registration is gone, the OAuth consent/token that BulkSignature uses to query your tenant becomes invalid, so any subsequent MS365 import call fails.
Who Can Fix This
A user with global admin (tenant administrator) privileges in Microsoft 365 / Entra must perform the re-connect, because granting consent to the BulkSignature application requires admin permissions.
Resolution — Re-connect the MS Integration
Sign in to BulkSignature using a Microsoft 365 super admin account.
Open the import screen and click Import user data from MS365.
You will see the backend error and the Re-connect MS integration button.
Click Re-connect MS integration.
You will be redirected to the Microsoft sign-in / consent screen for the BulkSignature Email Signatures 365 app.
Sign in and accept the permissions requested by the application.
This re-adds the BulkSignature Email Signatures 365 app under Entra admin center → Enterprise applications.
You should see confirmation that the MS integration is set up successfully.
Click Import user data from MS365 again.
User data should now import successfully.
Expected Result After the Fix
The BulkSignature Email Signatures 365 application is present again in Entra enterprise applications.
The Re-connect MS integration button is no longer displayed.
MS365 user and group imports complete without errors.
How to Prevent This in the Future
To avoid accidental disruption of the MS365 integration:
Before removing enterprise applications in Entra, confirm whether BulkSignature Email Signatures 365 is still in use.
If you need to perform tenant cleanup, consider disabling the app temporarily instead of deleting it, and re-enable it afterwards.
Limit who has permissions to delete enterprise applications in the Entra admin center.
Still Not Working?
If the import continues to fail after re-connecting:
Make sure you signed in with a tenant global admin, not a regular user.
Verify that admin consent was granted on the Microsoft consent screen (not skipped).
Check in Entra admin center → Enterprise applications that BulkSignature Email Signatures 365 now appears and is enabled for users to sign in.
Contact BulkSignature support with your tenant ID and the time of the failed import for further investigation.