Hello @tirelibirefe, hope you are doing great !!!
The error message "msg":"Forbidden","ApiDefinition":"default/default-httpbin-ingress-6ca0a8e8a","body":"{\"status\":\"error\",\"message\":\"Attempted administrative access with invalid or missing key!\"}\n"} says that you don’t have the necessary right privileges to access/refer the apis definition via the gateway.
The above error log message can be due to the wrong secret value passed to the parameter “TYK_AUTH” while creating the secret “tyk-operator-conf” as a pre-requisite before installing the operator.
Make sure the value of TYK_AUTH from tyk-operator-conf secret matches with the APISecret value from secrets-tyk-*** secret resource.
*** - can be pro or ce depending on your gateway installation .
Hope this helps !!!