One screenshot usually settles it in a single reply.
Try this first — it answers most problems in seconds.
Open ReadBridge, go to the AI key screen, and press
Test & save even if your key is
already saved. It checks the two Google services separately and names which one is failing and
why. Most of what people write in about is answered right there, and in
the help guide.
Support covers ReadBridge itself. Your Google account, its billing and quotas are
between you and Google — see Billing and
the API dashboard.