I have long used a Claude action with my API key but it now (I have update to iOS 27 beta 3) it throws an error when I try to invoke it. Where do I find the credentials to enter a new key, and what else might cause the Claude action to malfunction?
Try under Settings > Credentials. If you remove a credential, next time it is called, you should be prompted for.it.
Check the action log for more detailed logging when an error occurs. It might have more useful dump of what might be going wrong.