Seems like you’ve accidentally done what others wish they could do with the Smartthings cam. Being that shared members can’t view video clips from the cams, only the main account.
Strange, no doubt, but I have no idea other than maybe the nature of these devices being wifi and behaving differently than the typical devices.
That offers a clue for a possible work around for the ST cam issue, but somehow you remained authenticated and, I’m assuming the Videos and Vision device tiles remained there?
I find it interesting, but I’m just as baffled as you.