Hey 8exnvghm3vmu,
Thanks for double-checking those settings. While I completely understand having that set to Auto for travel purposes, is there any change if you manually set it? You're welcome to change it back to Auto after checking of course, but that would help eliminate that as a possibility.
Aside from that, since you're able to log in on another device, this fortunately doesn't seem to be an account related issue either. There are a few other device-specific steps to try in that case. You can see the full list here for additional steps, but I'd be sure to at least give the options below a try.
Clear both the cache and app data. The link above has specific steps if needed, but this is typically under Settings > Apps > FC Mobile > Storage. Clear both, then restart the phone and try again to see if there's any change.
You can also try changing the network being used, for example launching once on WiFi and then once on mobile data instead. If you use any ad blocker or VPN apps, or any others that might filter your network traffic, try disabling those temporarily before trying again as well.