Using Classic Outlook on Windows for personal email, calendar, and contact management
Hi Esther
Good day.
Thank you for sharing some information in Microsoft community.
According to your several messages, I have found one known issue information article Error “Something Went Wrong [1001]” signing in to Microsoft 365 Desktop Applications - Microsoft Support, our relevant team is investigating the issue, and they will update the information article once the issue will be in Fixed status.
Note: error code is different in the above provided article, but seems like the behavior may be similar about sign in issue for Office applications.
According to your mentioned situation, I have also consulted with our team and would like to share more specific information with you, in order of your given situation, this query should be transferred to a specific support team. As an Office 365 global admin, you may need to contact our Office 365 support team on the back-end side via an open service request so they can diagnose this specific scenario through some more technical resources, if needed, they may be collecting some information from logs for later diagnosis. They can escalate this issue to the next level of the support team after collecting information from logs. Since forum moderators have limited permissions and access resources, for this reason we are unable to collect certain detailed information in the public forum for data privacy. After diagnosing the scenario, they can provide possible information on your end.
For this standard process, here's the official document for the global admin: Get support - Microsoft 365 admin | Microsoft Learn
Important note: If any organization's Office 365 Business/Business/Education subscription is from a syndicated partner or reseller, and if the global admin can't open the service request on your end, you may need to contact the reseller's support provider so they can help the global admin open the service request on your end. after the Office 365 support team can participate in the service request.
I would really appreciate your valuable time. Thank you for your kind cooperation.
Sincerely
Darpan