Tibber integration won't start

My Tibber integration has worked very well for so long, but suddenly:
After a HA restart, the Tibber integration fails.
I get these error messages:

2021-11-23 19:40:14 ERROR (MainThread) [tibber] Received non-compatible response [{'message': 'Expected Iterable, but did not find one for field Home.subscriptions.', 'locations': [{'line': 8, 'column': 15}], 'path': ['viewer', 'homes', 0, 'subscriptions'], 'extensions': {'code': 'INTERNAL_SERVER_ERROR', 'exception': {'message': 'Expected Iterable, but did not find one for field Home.subscriptions.'}}}]
2021-11-23 19:40:14 ERROR (MainThread) [tibber] Expected Iterable, but did not find one for field Home.subscriptions.

I tried to delete and add the integration. When I paste the token, it says “Invalid access token”.
After I try to generate a new token at developer.tibber.com, I get the same, so I can’t add it at all.
HA Core 2011.11.5, HA Blue.

Very strange, but after several restarts and attempts since yesterday, the integration was added with success today!
I don’t know how/why, but I hope it’s stable again now.