Currently I'm not able to login into SO by using ClaimID.
The problem is that i will be forwarded to ClaimID and they are also tell me, that i'm successfully logged into ClaimID with my user credentials. But from there I won't be forwarded to SO again.
Even if i manually switch back to SO I'm not logged into it. Unfortunately i don't have any saved credentials anymore in my browser (hence i wouldn't run into this problem). I also already sent a mail to ClaimID support but didn't get back any answer till now.
Currently i just created a new account to simply ask this question but i would be glad if i could get my old account back to work by pairing it with my new StackExchange login somehow.