Spotify Connect through Wi-Fi has stopped working for me this morning, when it was working fine last night. This is not specific to Android, but I could not find another more accurate category.

I've tried controlling Spotify with Android, PC and Mac, and all hit the same issue. I have tried connecting both to an Audioengine A1-MR speaker and a Denon A/V receiver through Spotify Connect via Wi-Fi. In both cases, I see the device listed on the Spotify app, and it attempts to connect for half a second and then fails and I can only use the current device.

My internet is through AT&T Fiber, and I use their required supplied Gateway.

Bluetooth is not affected... I can connect to a bluetooth speaker fine. Only Wi-Fi's Spotify Connect is affected. Everything was working 10 hours ago.

I have tried restarting my wi-fi router, restarting the speaker, and updating the app on my Android phone, and none of that changes the behavior.