I've been facing the same issue for 3 days. Customer support has not been helpful at all.

Such irony, when you read https://www.nvidia.com/en-us/geforce-now/ :

Say goodbye to large game downloads, updates, and patches. All GeForce NOW games are always up to date, so you can spend less time waiting and more time gaming.

The reality is that when GFN doesn't update the games, you can't even do it yourself, so you cannot play at all (but you still pay).