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 Essential (Squad) can’t refresh authorization tokens for tenants. This has not impacted all tenants.
After the issue was fixed with Atlassian, it took a long time for all authorization tokens to be refreshed for Zephyr Essential (Squad). 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.