Upon initializing the integration (i.e. adding hubs, reloading integration or restarting HA) a "permission error" is fired. That error looks like:
ERROR (MainThread) [custom_components.diveracontrol.divera_data] Error fetching vehicle property for vehicle id '12345': Permission denied for getting vehicle properties on cluster 98765

Its a known issue, I am working on. It does not effect the funtions or available data.

Reason: The mentioned "permission check" is based on the access-data from Divera, thus the user permissions of Divera itself. Upon initializing the integration the access data is not yet available, which is why the error comes up, With the next data update (standard: every 60s) the "vehicle properties" will be fetched correctly.

Expected solution: I am planning to rework the permission check, which will include work on that bug. Until then I am not addressing that specifically.