Had the same issue. Got a eufy camera today and couldnt connect to the camera device while on 4G. Saw that someone in this thread talked about installing a VPN app which makes the phone think wifi is on. VPN unfortunately isnt free.
I just turned on my wifi on the phone, even if its not connected to any wifi network, that made it work!
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This was the solution, i selected the option that supports both ipv4 and ipv6.
Don’t kmow why but on my samsung phone mobile network I need the VPN on for eufy to work and on my wife’s it doesn’t need the VPN on. I hope that Eufy can resolve this one for me