The issue has been caused by an error with the Forge platform, logged by Atlassian on their StatusPage: https://jira-software.status.atlassian.com/incidents/c436c8y239dv
With Forge not processing scheduled tiggers properly, Zephyr can’t refresh authorization tokens for tenants. This has not impacted all tenants, but about 300-400 tenants were still impacted.
After the issue was fixed with Atlassian, it took a long time for all authorization tokens to be refreshed for Zephyr. We are following up with Atlassian to check why it has taken so long, and what can be done in the future to minimize the impact for Forge apps.
We apologise any inconvenience.