Hi @hemant kumar , The user that you're logging in with doesn't belong to the Azure AD tenant. You'll need to sign in with a user that's part of the tenant or have an Admin re-invite you as a Guest user using your Gmail email address. You may also need to invite them as an external user.If your user is still part of the tenant, you can also try logging in through a Private Browser to see if that resolves your issue. More information here.
Please let me know if you have any questions and I can help you further.
If this answer helps you please mark "Accept Answer" so other users can reference it.
Thank you,
James