Can this be sold? I can't find it in my inventory but it is in my quest list. Do I have to complete it first? Did I make a mistake accepting it as a quest?
ZOS should be embarrassed by this implementation. It's sloppy, inelegant, confusing and annoying. It provides no positive game experience unless you enjoy being trolled, tricked or swindled out of your master writ. There is no reason at all for a quest pop up upon receiving a master writ. Shame on ZOS. You're better than this.
Yeah, once you accept it, it's bound to your character.
What's worse, if you have multiple characters it's easy to open it on the wrong one, making it completely useless.
If you want to sell master writs, you have to cancel the dialog that pops up after you pick it up.
That moves it into your inventory and you can then sell the writ (or give it to another character).