Outlook is one of the most used email services worldwide after Gmail. But, many people are reporting that they are getting a unknown popup in which they have to verify the Outlook certificate & not able to access their Outlook Mail Account. In this thread, we are going to share how you can easily fix this Outlook issue via few steps:
Launch the Microsoft Outlook.
Then visit the File > Options > Add ins
Now you can see an option "Disable Add ons"
Simply disable it & restart the Outlook Application.
This steps will definitely help you to fix this problem.