[XB1] Repeated disconnects whenever I attempt to play Adventure game types

I’ve taken a brief hiatus from the game for a little over three weeks and I tried to play some online races. However, every time I enter matchmaking for an Adventure game, I am never able to advance beyond the car select before I am abruptly disconnected. I have no issues connecting to Horizon Life nor do I have any problems using any other Xbox Live service on my console. I am running a wired setup and my NAT is open. All Xbox One network tests are passing. What could possibly be causing this?

I’m having the exact same issue as of today. NAT type is open, all other services on my internet and on Xbox are working just fine. But I’m getting disconnected from every single adventure lobby I join…