Hello,
I'm having this error from a couple of hours now.
Nothing changed on my connection, no windows updates, no router or modem firmware updates.
I had already gone in all the troubleshooting guides both on Forza Support Site and Xbox site, I already opened and forwarded all the ports needed from Forza Horizon 4.
I'm on PC
Already rebooted and power-cycled both the PC and router.
All the other games/websites works fine.
Anyone having the same error? Any help?