Having similar issues.
My daughter started playing last season on her own PC. We had no problems making a fireteam and getting in adventures.
After the update, she fails to join me and I fail to join her every single time. We are on the same network. The troubleshooting steps say to make sure you use upnp with your router. It is on and it is working according to our router status page.
We're even seeing errors connecting to friends.
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Turns out, I updated my firmware on my router and things started working again.
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Make that kinda working again. We were good all day yesterday, but this morning she ended up with a TON of BEAVER errors. I could see her in game but she couldn't see me.