I cannot join fireteam of my husband in the same household - xbox. I've tried the MAC, resetting, removing and adding back account, & putting one on wired and one on wireless.
Tried the method in the youtube link and I could connect. This issue needs addressed. I never had an issue until the recent update.
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Sadly, none of those work around worked for my husband and I, but joining through the clan roster has worked really well for us.