Live view only works on WiFi not mobile data EE

Been struggling to get live view working on EE mobile data on Sony android. Spent an hour on call to Ring but still nothing. Signal strengths fine, reinstalled apps, devices, deleted conflicting programmes, reset network and mobile data, etc.etc. Works fine on iPad and on another android phone. Records clips but live view just circles trying to connect. Pretty dirty app by looks of it - with the vast volume of issues how can these products be fit for market? I’ll give it one more go before I chuck in the bin unless supplier will refund. Any thoughts and please don’t send the stock range of things to consider as done them all. Wasting money on the Protect Plan for two doorbells also.