It shouldn't be a problem. I've deleted mine before, and on the last one I finished the "intro" and started doing pledges before even taking the invitation from my mail.

Just go to your Undaunted Enclave, talk to both NPC where prompted, sign the book, get your bronze key, and you're off slaying beasts and collecting keys to your heart's content.

Go to the first group dungeon in your native zone (spindle, banished cells, or fungal). Outside is an NPC connected to the undaunted. Their quest will give you the skill line in stead of the invite (had to do this a few times cause I'm not the brightest with mail xD)

That is the start of The Undaunted initiation quest.

You should try joining The Undaunted first, then you can go and see if you can complete the quest for pledges at The Undaunted Enclave afterwards.

Yeah this happened to be on my 3rd toon I'm oN dc side all you have to do is whatever tavern your supposed to get the quest from then goto whatever dung your supposed to run to finish for me it was splindle after I complete go back to enclave turn it in then your good to go its just like your assigned your 1st pledge ever after you complete you'll be able to pick up pledges.