Connection issue after login

[MyPod]

I've installed Koel on a new android phone and I'm experiencing problems right after the login. On the phone I get "The request cannot be completed. Please double check if you are connected to the Internet." but checking the server logs I see a connection attempt to GET /api/data which succeeds with HTTP 200. This is happening even while being on the same network as the server instance - I don't believe anything else is required?

The full set of logs on the server is:
"POST /api/me/otp HTTP/1.1" 200 156 "-" "Dart/3.7 (dart:io)"
"GET /api/me HTTP/1.1" 200 637 "-" "Dart/3.7 (dart:io)"
"GET /api/data HTTP/1.1" 200 1693 "-" "Dart/3.7 (dart:io)"