I went through the process of setting up a reverse proxy for Home Assistant, and I can access it fine externally. Any device I try it on works, except for my Wife’s phone. She can access the server just fine on the local network, or if going to the reverse proxy in a web browser externally, but just not externally on the app - she gets the attached error.
Would would be causing this specific issue?
As far as I can tell, everything is configured correctly. I octuple-checked she had the right external url in the settings, going as far as to copy and paste it multiple times to make sure it is in correctly.