Hi,
Please refer to the suggestions of Hari. If possible, please provide us with the screenshot of the error message so we can help you better.
(If you cannot put the screenshot here, you can upload it to OneDrive (https://onedrive.live.com/) and then share the link here. )
Besides, it is suggested to start your Outlook in safe mode (Press Win + R, type “outlook /safe”, press Enter.) and see if the issue continues. Because there could be some add-ins in your Outlook client that cause this issue.
Any update, please feel free to post back.
Regards,
Aidan Wang
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