There's nothing special required to debug the custom tilemap use. Open the browser debugger and you should see some errors there. You should also check the network console and see if you're getting error responses from your tilemap server.
There should be some other parameters you should add to the tilemap URL though. can you share your full kibana.yml file, with any sensitve information removed of course. It would be useful to help figure out what might be missing.
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