I'm using the latest version of pyload-android from F-DROID and have the same issue like here.
I've configured everything with following values:
username: <my username working with web gui (admin access)>
password:
address: 192.168.1.55 (tried 0.0.0.0 too)
port 7227
I'm using the app only in my local network (not from WAN) but I'm not able to connect with it.
It's also not possible to switch the app to dark mode (like my whole UI on my smartphone) - but this is not the most important problem. :-)