Cant join minecraft multiplayer on pc

Hi Hakotek, I hope you're doing great out there despite the issue that you're experiencing. I am an Independent advisor and I am here to help you in regards to your concern.

If you were redirected to a support page it means that the system detects your account as a child account, to manage it please sign in to https://account.microsoft.com/family and check if there is an organizer account linked to your account then use the organizer account to sign in to https://account.xbox.com/settings then "allow" the setting on this screenshot:

Hello,

This may possibly be because you have settings that restrict this, especially on child accounts, if that applies to you. To change this, you must find the "Allow to join multiplayer games" in account privacy settings, and set this to allow. This also maybe that you need Xbox Live Gold, as you need Xbox Live Gold to play any games online that aren't free. E.g. free games like Fortnite and Roblox are online games, but both free to play meaning you don't need Xbox Live Gold to play them. But you need Xbox Live Gold to play online on games that you have to pay to download, e.g. Minecraft.

I hope this helped,

Have a good day

You will need to manage your privacy and online setting by following what's mentioned here =>Manage Xbox online safety and privacy settings | Xbox Support.

From Minecraft/Microsoft -

https://minecraft.net/en-us/article/minecraft-multiplayer-server-safety

“Join Multiplayer Games” Settings
If you have your settings set to block joining multiplayer games, you can’t join any multiplayer games in Minecraft, including shared local worlds, Realms or servers. To enable multiplayer in Minecraft, make sure this setting is set to ‘Allow.’

However, just like ASCllnaut, that setting was already turned on for my children. In other words I'm in the same boat, we can play on the LAN but not on a realm.

Who is joining which world? Are you joining her world on PC, or is she joining your world on Xbox?

Was there any change in both of your networking environment, or was additional software installed on her PC like an anti-virus program that came with a third party firewall?

Also are your worlds set to allow multiplayer in the world settings before you enter your world?

Do you get a specific error message that prevents you from joining the multiplayer world?

Did someone join the Minecraft Beta through the Insider Program and is now on a "newer" Minecraft version?

As the others already mentioned, did you make sure both your
online and privacy settings allow you to play online multiplayer and see other people's creations?