@reallylazybear I hate to be the bringer of bad news, but you are bound to get problems, it seems they require you to re-connect with the phone from time to time, it seems it doesn't really support multi-device without a dependency on a main device, for an app that has good multi-device without phone numbers check #ArcaneChat (https://arcanechat.me) and #DeltaChat
for problems with signal multi-device see:
https://framapiaf.org/@jeeynet/114177155835278699