Hi!
Few things to check basically. Can you share the API definition for your TCP API and also share your tyk.conf file for how the gateway is setup (or equivalent ENV vars as they override the config settings if set). Finally can you share the logs of the gateway that is loading the TCP API from startup please - particularly interested in the ports setup of the API in question basically.
Between all these bits of info we’ll work out what the issue is.
Cheers!
Josh