There are also a bunch of books from project Gutenberg that have images and nice formatting on standardebooks.org/
Moosely
Their song "Computers" is the best way to musically describe working a shitty job and then hitting that glorious weekend only to have to do it all over again.
Yeah I always feel incredibly dumb when I have to edit them. It's also the only thing I could think of that might be causing issue with OPs tailnet.
Firstly, what type of things are you trying to allow your friend to do on your tailnet? I've had trouble in the past trying to get friends to connect to game servers across tailnets, but have been fine connecting friends to things like Jellyfin. Any information on this might be helpful to look over.
Secondly, Have you checked out the ACLs? Access controls to your network can sometimes make things not play nice. Here is the docs on managing your Access control list.
I'm torn between fake McCoys and calling them Decoy McCoys