vigna

Grazie! Sono felice di avere risolto grazie al tuo prezioso aiuto!

That message means you've already added the same device with another service and the contents of those services are conflicting with each other. 
Try this:
Quit the application/game/client completely Remove device from the Geo-Filter Give PC PlayStation Device Type in the Device Manager (if on PC) Resync from the Geo-Filter Map menu Re-add the device to the Geo-Filter with the manual option Set up the Geo-Filter how you like Wait 2 minutes Boot up application/game/client Then see if it works better.
What is the model of the modem/router the XR is connected to and how have you set that to ensure all traffic flows to the XR? E.g. XR in its DMZ, modem/bridge mode
How have you setup QoS?

For QoS I'd suggest putting the Congestion Control download percentage down, try 70% and experiment from there.
Priority on the fritz I don't think would be correct, the DMZ - I think it's called exposed host on the fritz, put the XR WAN IP (found on the XR System Information page) in it 

You're very welcome, do let us know how you get on

I can't tell what it's asking really but you shouldn't need to change anything further, put it in and that's it

That's great to hear, thanks for the update, you're very welcome!