When my children and I try to play Minecraft Dungeons at the same time on our three computers with three separate, full accounts that have all purchased the game, we all get the "unable to verify game ownership" popup at different times. Their Microsoft accounts are linked to mine as family members, but they purchased full licenses for their own accounts and are not sharing my license.

The Launcher does not indicate that there is any issue verifying our account, and we are able to log into the game without issue. Then when we are in the game, the popup occurs and prevents us from effectively playing the game.

Last night my daughter and I were able to play without issue, but my son kept getting the popup after logging in after us. This morning my son logged in without issue, but now all three of us are receiving the popup after my daughter and I logged in after him.

I'm starting to suspect there is an issue authenticating multiple accounts from the same location. I'll update this report as we continue troubleshooting and testing our connections to try to get us all on at the same time in case I find something that works.