It ‘can’ work but 5g is 5g either through an thetered phone or as an mifi router both use the same type of aerial connection. And as ham amateur I know that that can cause huge issues. Not saying it can’t work but the latency can differ a lot causing huge lag issues.
vpn can level it out, but TM has rules about connecting through vpn.
I hope you get it to work, but it will always be an undesirable way to play online games.