Should be able to sign out, and sign in with your own account.
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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I just had a new motherboard installed on my computer and the technician logged me in to Microsoft with the wrong name. I can access Microsoft Online, but not Office on my Desktop. I want to use the desktop version of Excel, not the app. I'm not sure if I'm explaining this correctly, but I hope it makes sense.
Should be able to sign out, and sign in with your own account.
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
Hi @Marla Koosed ,
Did you mean you cannot open Office apps?
Did you get any error messages?
What version of Office did you use?
I suggest you try to repair the Office:
https://support.microsoft.com/en-us/office/repair-an-office-application-7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b?ui=en-us&rs=en-us&ad=us
I also suggest you try to remove all Office Credentials from Windows, open Control Panel- select Credential Manager- under Web Credentials and Windows Credentials- remove all Office Credentials from list. Then re-start Windows and check if this issue still existed.
Just checking in to see if the information was helpful. Please let us know if you would like further assistance.
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