No DNS Record for fake domain

Can I survive without a DNS record for my “fake” domain?

I would presume this is the root cause why I get a http failure response for https://cluster.example.dev:30186/api/v1/admin/settings/customlinks: 503 Service Unavailable while visiting the https://cluster.example.dev:30186/ where 30186 is the port.
Then I press log in and get an unregistered redirect_uri (“https://cluster.example.dev:30186/projects”).

The .dev TLD is quite real, and domains from it resolve. Ether way, you will not receive Lets Encrypt certificates using “fake” domains. Please use the real domain.

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