Unable to upgrade Youtrack when using an external Hub

Hi,

i tried to upgrade Youtrack and Hub to the latest version, but failed when i tried to load the backup from the previous version.

For our Youtrack installation we use 2 Docker-containers. One with an external Hub and one with Youtrack.

The Hub upgrade was successful. I backed up the database from the previous version, removed the container, pulled the new image and started it up. Then i loaded the backup and everything worked fine.

I did the same with the Youtrack update: Backed up the previous version, removed the container, loaded the new image and started the new container. But when i want to load the backup i get the following error message:

The selected archive file contains a valid YouTrack database, but does not contain data of built-in Hub. Please select an existing YouTrack installation or a valid YouTrack backup that contains Hub database

So it seems that Youtrack doesn't recognise the external hub.

Is there any way to get it work? Maybe a parameter that links to the external hub?