I changed the Mail-Address of a user in the active directory and did a sync via the admin UI. Grommunio updated the username etc.
When the user now tries to log in via Webmail it fails with Error 500 - Internal Server Error. Adding this Mailbox to Outlook works without any problems.
nginx-web-error.log shows the following error:
Failed to open store. firstname.lastname@example.org requested (Default store)PHP message: Failed to open store.
Any ideas how to resolve this behavior?