I have a dachshund pup around the same age - 10 weeks now, had very similar problems with sending obi to sleep. Dachshunds are extremely stubborn, obi was adamant that he wanted to sleep with my partner and i as opposed to by himself in the loungeroom. As a compromise we moved his bed into our bedroom, the first few days he whined and whined however after a week he has resigned himself to sleeping in his own bed in the corner of our bedroom that we've blocked off for him to sleep in. Last night he went off to sleep without a peep and slept the whole night! I guess the moral of this story is that you need to be persistant and consistant, as with all breeds but esp. with Dachshunds because they are so determined!
Good Luck!