Did you tried Sign-Off from everywhere + Delete Cache + switching devices/Platform/Browser?
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Error Code 50140
Message This occurred due to 'Keep me signed in' interrupt when the user was signing in.
Remediation This is an expected part of the login flow, where a user is asked if they want to remain signed into this browser to make further logins easier. For more details, see https://techcommunity.microsoft.com/t5/Azure-Active-Directory/The-new-Azure-AD-sign-in-and-Keep-me-signed-in-experiences/td-p/128267