I bought a Steam Deck for my sister and set up her account and mine on the device. Family Sharing works fine until the Deck is rebooted, where only her games appear on her account.These are the steps we have followed:
Sign in both accounts to the Deck
Enable family sharing on both accounts, making sure our accounts and this specific Deck are authorized
I didn't sign out my account afterwards or anything like that. My games will appear on her library until the Deck is shut down or rebooted. The next boot my games won't appear on her list and those that are installed will show a Buy button instead of play.
We found a workaround which is to sign in with my account, disable and enable family sharing again, but this is not really a solution.
Has anything like this happened to anyone? Is there anything we are missing?
So after some trial and error I found out it's somehow the official Steam Dock. It breaks family sharing on shutdown, reboot and suspension.
The solution seems to be unplugging the Dock whenever any reboot, shutdown or suspension action is going to be done and replug it only when the Deck is active and signed in.
Really weird bug. I didn't even think the Dock could be an issue in this regard.
I've had a few random logout issues and dock weirdness.
Try the beta branch. More updates and reboots but maybe they've fixed the issue? I'd also suggest opening a support ticket so Value can document the issue and possibly fix it in and update. If they don't know, they can't fix it!