ATV4 - Play RealRacing3 with multiplayer iOS controllers

Hello,

i read last year's posts about AppleTV ans iOS Controllers without finding a solution to my problem.

I am playing RealRacing3 on AppleTV 4th generation.

I have the Apple TV Siri Remote and a MFI Steelseries Nimbus Controllers. Both of them work well and i can play with 2 players using these devices as controllers.

Now i am trying to play up to 4 players adding iOS devices (iPhone SE iOS11.4.1) as controllers, either with the 'Control Center Apple TV Remote' or the 'Apple TV Remote App'.

The iOS Devices are paired, connected and recognized by the Apple TV4: i can navigate and launch Apps.

However, when starting the multiplayer mode in RR3, they are no more recognized.

Any idea of what i am doing wrong?

Asking google tells me it should be possible (https://9to5mac.com/2016/02/16/real-racing-3-apple-tv-video/), so it is on my side, some settings probably.

Thanks in advance for the advices.

Sebastien