Cannot add Salesforce App Addin, In Users Outlook in our org. Both in the New Outlook and the Old Outlook does not work.

Hi Team,

I am having trouble adding the Salesforce app into all users Outlook in my Org. It use to work before, but now we get this error when we try to add the Salesforce app add in into Outlook.

I have updated their Outlook and Cleared the Cache, but the issue is still happening.

I have attached the screenshot of the error.

Please let me know on how to resolve this issue.