This happens when any of the setup tasks fails to complete, this can be due to the host not being completely ready when the Supervisor starts or that DBUS is not properly working.
If the issue is related to DBUS, you will see an unsupported message about that as well; You can have a look here on how to resolve that.
If DBUS is not the problem, the first thing you should try is to restart the Supervisor.
This can also be done with the CLI, by running the following command:
ha supervisor restart
If this does not help, you can try to reboot the host. If you are running Home Assistant Operating System, this can be done from the “System” tab in the Supervisor panel. On the card for “Host System”, there is a button to reboot the host.
To help us make the setup more robust, please enable the sharing of diagnostics and crash logs on the Settings > System > Analytics panel.