S40 failure to connect to network

Eufy s40, great looking piece of kit. But that’s all will only connect to certain selected networks(2.4GHz), with a very stable connection. I’m on a Marina wanted it see my boat and weather from afar on my Samsung S20 phone. Setup is simple but no connection. Should have hassle free connection. In the end I connected and setup by using a second phone with a sim card as a wifi gateway @ 2.4GHz. Youtube is worth a look.