You made me realize something however, we are using a service account which does not have someone regularly logging in to ADO with, it may be related to this information i found:
Q: Why did my PAT stop working?
A: PAT authentication requires you to regularly sign into Azure DevOps using the full authentication flow. Once every 30 days is sufficient for many, but you may need to sign in more often than that depending upon your Azure Active Directory configuration. If your PAT stops working, first try signing into your organization, ensuring that you go through the full authentication prompt. If your PAT still doesn’t work after that, check to see if your PAT has expired.