First, ALL instanced 4 person Dungeons are Undaunted. They start from Level 10 and up. You can technically enter ANY of these Dungeons even vastly underleved and it will default the difficulty to that Dungeon's minimum, like Level 10 for Banished Cells. Second, as @Jakhajay said the daily Pledges for the Bronze and Silver Keys open up at Level 45. The daily Vet Pledges for the Silver and Gold Keys open up at VR1.
The "Your Veteran level is not high enough" message is a known bug that they still haven't fixed, it has nothing to do with 1.6.2 being on PTS (it's not actually on Live yet like you stated in your OP) as it's been effecting Live for a while now, just randomly. Using my lowest Character on Live (LvL 7) here is what I saw when trying to enter each Zone's Dungeon group (only tried 1 per set of 3):No it won't. Apparently the level after you have done the initial quest is 20 plus. I logged on live and got the same message when I try to enter Banish Cell and Eden Hollow with my level 16. "Veteran level is not high enough." I have no idea when this changed but that is how it appears to be on both test and live.
As to the undaunted pledges I say again thanks so much obviously having the helm and shoulders from Spindleclutch means I need this explained to me.
+1This is fairly well known issue on live since the arrival of pledges. Because the dungeon difficulty button is missing from non vet ui. Some people get bugged and are unable to enter via the ' you are not of sufficient level ' bs etc. Workaround is to group with a vet and have them reset your difficulty. Today when I did this for a group of 17s trying to do BC, I wound up having to invite each of them one by one and reset because we could not figure out who was bugged. I hope ZOS gets this fixed because it is very frustrating for the non vet, non pledge level groups just trying to enjoy a proper group dungeon. Peace.
This is fairly well known issue on live since the arrival of pledges. Because the dungeon difficulty button is missing from non vet ui. Some people get bugged and are unable to enter via the ' you are not of sufficient level ' bs etc. Workaround is to group with a vet and have them reset your difficulty. Today when I did this for a group of 17s trying to do BC, I wound up having to invite each of them one by one and reset because we could not figure out who was bugged. I hope ZOS gets this fixed because it is very frustrating for the non vet, non pledge level groups just trying to enjoy a proper group dungeon. Peace.