If a previously working helm login results in authorization error
First, check that your password and username are indeed correct. If so, check with your CircleCI account team on the timeline for renewal of the licensing used for your Server install.
You may need to install the new license and use a new Azure ACR token/password (K8s Registry Credential) and update this license in your helm value file followed by a helm deployment.
There is no expected downtime with this helm deploy