We have several users, and most of the users can send and receive workflow notifications without errors using the auto-notification of the workflow(Purchase order Approval). Unfortunately, when a few users submit a purchase order for approval, the notifications/emails to the approver are not generated. When we look at the email outbox, we see this error message "Could not get access token. Please, try to log out and log in again." We have reset the password in outlook and azure. We have been able to send the test emails. (search > email account> had the user select the email account> select process> send test email. The test email works, and they receive the email.
If that same user clicks on the email outbox, opens the notification email, and clicks send it, send it to the approver. So it is something with the user and the workflow notifications. I have check the user setup and approver user setup all are setup with notifications. Any help is much appreciated! Thanks everyone!

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