One of the most frequent reasons why this happens is because the client that the Authorization Extension creates, auth0-authz, was deleted. It shouldn’t be deleted, as explained in our documentation.
To fix this issue, the Authorization Extension has to be removed by deleting the webtask it creates.
(Optional) List the extensions you have installed by using wt ls -p {tenant-profile}. The tenant profile is usually “your-tenant-default” and it’s established when you’re setting up wt.
Use wt rm {extension-hash} -p {tenant-profile} to remove the extension. The hash of the Authorization Extension is adf6e2f2b84784b57522e3b19dfc9201.
After doing this you can reinstall the extension if needed. Please make sure that the client auth0-authz is not deleted, it will be removed automatically if you uninstall the extension.