Home Xbox Game Pass Online Sharing Not Working

I have an account that has Game Pass Ultimate and have just set my xbox to home so other, non subscribed accounts can play online. The other accounts can play all the game pass games without having the subscription holder signed in, but non of them can play online. After doing 3 hours of troubleshooting I have deduced that this is a bug with the Xbox back end and I need my Game Pass multiplayer entitlement refreshed for the account. How would I go about getting the support team to do this, as the remarkably unhelpful AI chat bot they have as "customer service" is no better than looking up the issue online or following the help app on the xbox itself.

What I have tried:
Re-enabling reoccurring billing and disabling it, Power cycling the xbox, Resetting the subscription holder's home xbox, Redownloading the subscription holder account, Testing many different online games that require a subscription, pretty much anything short of a factory reset.

If anyone knows how to get into contact with a living person over at xbox to get the multiplayer entitlement refreshed, I would greatly appreciate you pointing me in the right direction.