I figured out the solution. Actually, my username and password are correct, but I still have to go to luci and edit my eduroam connection with cipher=forced ccmp, eap method = ttls (it looks like by default the eap method is tls). After that it works for me now.
How can the eduroam connection cipher and eap_method be edited in luci?
I initially set up the repeater to log-in to eduroam (which has the same "Connection failed, will retry later…" error), but when I check Luci in Network->Wireless, I cannot always see the "eduroam" wifi network. It only intermittently appears, then I try to edit the config as fast as possible, but when I Save the setting with TTLS and CCMP, it does not persist. Any help is welcome. Thank you.
I am using witih GL.iNet Flint (GL-AX1800) firmware 4.6.8.
Signal is -60dBm or better and I tried changing location with similar results. I think the main issue is that I am unable to set TTLS and CCMP for the eduroam repeater mode through Luci properly (or correctly?) - is there some documentation on how to do this specifically?
I am attempting to do it in Luci Network-Wireless but it seems the eduroam network that appears there is dynamically re-generated (and deleted upon connection failure) by the "repeater" mode in the GL.iNet admin page...
Third, you will be able to input all the necessary info.
The following figure should be very different from yours. But pls don't tick "replace wireless configuration".
I tried the above (disable repeater, manually connect to wifi network as client using luci) and there is still no internet. I reset the firmware settings (from gl.inet admin) and tried the above steps again with a different WiFi network (regular WPA, not eduroam) and strangely, it also does not work (so now it is not an eduroam-specific issue), see below for the screenshots of status and settings of the non-eduroam regular WPA wifi network after following your instructions:
Thank you for the help! For some reason, it sets "wlan0" by default instead of wwan. Upon double checking, it did enable manual repeater mode and is now connected to eduroam. The above screenshots were quite helpful.