Auto-naming does not work with mux-gateway keys.

[Neppkun]

The auto-naming feature fails with api_key_not_found error if you're using the mux-gateway.
Unsure how the auto-naming actually works, so dunno if it's a real bug. If this is intended (ie. mux-gateway won't generate workspace names), should probably change the message to mention that auto-naming isn't supported for mux-gateway instead.

[ammario]

Thanks for the report. It should be fixed upon next release or on the main build. See #1231.