Can't Play matchmaking, "Dedicated Server Problem"

I can’t play matchmaking games. When I try to play, loading map is at 0%, then it says “there was a problem with dedicated servers” and nothing helps at all. Restarting, cache clearing, resetting network, reinstall nothing works. Any idea anyone?
Can’t play anything matchmaking…even customs. (Offline customs work fine)

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Same issue here. Have tried Port Forwarding. Changing textures (map loads fine solo). Reset modems/routers.

Opened a ticket with support and got no help. I feel like everyone I know can play fine.

Swap to an alt port and restart

After disabling and enabling my network interface in network settings it worked.

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Can someone explain a solution if anyone find it please?
I can’t play and halo support just told me to wait while a temporary event is going, so frustating