Troubleshooting Outlook Add-in Authentication with Microsoft 365

Microsoft for Microsoft365 instances is deprecating legacy tokens, which will be shut down in the near future. This change may cause compatibility problems with Libraesva Outlook  add-ins.

If your Outlook add-ins looks as following pictures:

• ESG
  
• Email Archiver
  

How to enable Legacy Tokens

The following steps are required to ensure the functionality of the add-ins.

Proceed with legacy token power activation using PowerShell CLI.

1. Open PowerShell CLI
2. Import Exchange Online Management tools

   Import-Module ExchangeOnlineManagement

3. Update module to latest version

   Update-Module -Name ExchangeOnlineManagement

4. Connect with Microsoft 365 and sign-in with Administrator account

   Connect-ExchangeOnline

5. Run the following command to re-enable legacy tokens

   Set-AuthenticationPolicy –AllowLegacyExchangeTokens -Identity "LegacyExchangeTokens"