You can kill the last boss on vethm then go back on normal and kill the rest of the bosses on normal by yourself and it will count towards the 2 key reward.
With multiple threads regarding this issue with being stuck in queue, we are going to close the discussion. If you've not done so, please open a ticket with customer support for assistance.
It solves nothing, I will still queue as healer to get faster into dungeon <img class="emoji" src="https://forums.elderscrollsonline.com/resources/emoji/sunglasses.png" title=":sunglasses:" alt=":sunglasses:" height="20" />