I'm trying to set up my AX-55 as a repeater for a U Mobile 5G router (the box shaped one if it helps).

I have followed all the steps as listed in the online repeater setup guide and FAQ on what to do if the repeater won't connect to the internet, but the repeater's connection seems to have stopped working after the first 10 minutes. Devices connected to the repeater network are no longer connected to the internet.

Is there something specific to the U Mobile routers that I need to watch out for?

My Asus AX55 in access point mode appears to be malfunctioning and is now broadcasting the "default" open access network instead of the 5Ghz wifi.

This has persisted despite restarting the router. Will using the Quick Internet Setup to reset it as an access point work, and what options do I have if it does not?