The switch appears to be properly configured as a supplicant, but cannot gain access to the intended authenticator port on the switch to which it is connected

If aaa authentication port-access is configured for Local, ensure that you have entered the local login (operator-level) username and password of the authenticator switch into the identity and secret parameters of the supplicant configuration. If instead, you enter the enable (manager-level) username and password, access will be denied.