My experience with the official dock has been quite negative, it would sometimes not work until the power cable is unplugged and then plugged back - that is with all the latest stable updates for everything. Other people on Steam forums run into this issue too.
https://steamcommunity.com/app/1675200/discussions/3/3472864793317268180/
https://www.reddit.com/r/SteamDeck/comments/y3wbad/i_have_to_unplug_dock_every_time_i_change_inputs/
https://www.reddit.com/r/SteamDeck/comments/137tiut/steam_deck_dock_requires_unpluggingreplugging/
https://www.reddit.com/r/SteamDeck/comments/y59bl9/no_signal_when_i_connect_steam_deck_to_tv_using/
I’ve noticed the issue too late for a simple refund process and their support was not cooperative at all.
I recommend looking at other docks instead, will cost you less and work better.
That’s too bad. I guess I’ll 3D print something to hold the deck and just buy an Anker dock instead. I’ve been only playing handheld for now, but it would be fun to hook it up to my TV at some point.
I’ve heard good things about the jsaux dock but I haven’t used it myself so idk
