Game Controllers

Just tried to pair / activate new controllers, they appear as an option on the Zwift start up screen, as the system recognises my turbo trainer ( Trax2 S) as soon as I check the boxes for the righ & left game controller the Zwift sytem dropps connection to my smart trainer and the only way to re-connect is to turn everything off and re-start the programme - but the conncection / functionality drops as soon as the game controllers are re-connected.
I’ve deleted the Zwift app and re-installed it, disconnected the smart trainer and re-connected it and there is not difference - the controllers simply block the connection between the smat trainer and the Zwift programme.