Account Recovery Key Validation

I'm trying to set up account recovery by adding the recovery key the iPhone 13 generates when turning the toggle on. I type in the recovery key that I received pressed continue and keep getting error message “invalid recovery key” I've repeated the process a number of times and continue to get the same error. I want to turn on the Advanced Data Protection but can't because turning on the recovery key has to happen first. Am I doing something wrong or what is the problem