Refresh Token

Khaled_Arafat 

You are getting this error since your Refresh Token has been expired (I am sure, you already know this). By default, the lifetime for the refresh token is 90 days. The refresh token can be expired due to either if the password changed for the user or the token has been revoked either by user or admin through PowerShell or Azure AD portal.

See https://docs.microsoft.com/en-us/azure/active-directory/develop/refresh-tokens#revocation post to know more about Refresh Token Expiration : https://docs.microsoft.com/en-us/azure/active-directory/develop/refresh-tokens#revocation 

If your token not expired by anyone of the listed method in the above post, then confirm that you have configured Conditional Access policy and configured the Session -> Sign-in frequency control. This is an another way to control user Refresh Token and force user to sign-in again.

Refer the below post to know more about Authentication session management with Conditional Access.

https://docs.microsoft.com/en-us/azure/active-directory/conditional-access/howto-conditional-access-session-lifetime