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Office 365 "The authentication session has expired. Please sign-in again." Error Msg. Mac OSx 10.14.5

I just downloaded and installed Office 365.  When trying to log into Word, after inputting user ID and password, I receive this error message:

The authentication session has expired. Please sign-in again.

I have looked over previous posts and answers, and they don't seem to work.  The operating system software is up to date, and I have the lates version of Office 365.

I have the family plan for Office 365, and it installed without problem on my other Mac laptop.

Any help will be appreciated.

S. Alden

Answer
Answer
Hi S

My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.

Could you try the steps in the following article to see if it resolves this problem:

https://answers.microsoft.com/en-us/msoffice/fo...
Best regards,
Andre Da Costa
Independent Advisor for Directly

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I think, and this is a guess, the app Cookie 5 was somehow causing the problem.  (Cookie 5 allows for the management of cookies.)  I turned off Cookie 5, and I was able to sign in to Office 365 on the second family laptop.  I don't have Cookie 5 installed on my MacPro laptop, and that is possibly why I didn't encounter problems signing into Office 365 on my laptop.  Anyway, all is good now.

Thank everyone for their help.  I really appreciate your efforts.

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Last updated September 18, 2023 Views 15,467 Applies to: