I'm testing on a slightly older version (3.52.21) and am seemingly unable to replicate the issue that you're having. This generally means that the the token isn't being successfully retrieved from the authorization server in the first place. Of particular note, I see exactly what you do when I make an intentional mistake in the resource configuration.
I'd recommend manually hitting the /v1/token endpoint with Postman or something similar in order to verify that the combination of client_id, client_secret, scope, etc. is valid and then double check that all those values have been correctly entered into Retool!