If I validate the refresh token too much, will "invalid_client" be returned?

According to Apple documents, " Apple’s servers may throttle your call if you attempt to verify a user’s Apple ID more than once a day".

that "throttle" means that apple server will return "invalid_client"?

when we log in with Sign in with Apple while verifying the refresh token, sometimes log in successfully, and sometimes "invalid_client" is returned.

The access token issued by Apple will expire in 3600 seconds. The only way to get a new token is redeeming it via refresh token. Then why is there a rule to throttle such calls if requested more than once a day. Absurd!

If I validate the refresh token too much, will "invalid_client" be returned?
 
 
Q