Hi @Keerthana P welcome to the Atlassian Community forum.
I'm sorry to hear about the error you receive when adding Microsoft Account. May I request you to :
1) Try clearing your browser's cache, temp files, cookies and check.
2) Try login / connect from an incognito browser and check if you are able to succeed and let us know.
3) If the above 2 steps didn't worked out, I would suggest share your HAR file with the Atlassian Support team for thorough investigation and troubleshooting.
Stay safe and stay healthy.
Thanks , Its working Now!
Great and I'm glad to hear that.
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