Hi Stefan,
Sorry but I can’t find any way on the DHL website to create a pre-paid returns label from France to Germany.
I’m lost in the DHL website. Wich service may I use to create a label with your account number ?
Have you got a link for me ?
When I have to send back an item to a big online music store that is in Germany, they send me a pre-paid returns lablel in PDF, it’s more easy for me.
Send me a PM if you want, because it’s probably not the right place to post such messages about shipping.
EDIT : I have just spend an half hour to find a way to ship my UR22 with DHL the only shipping available method I have found is DHL express for 104 euros 
So could you please add more details and explain a little bit more how to send you back easily the unit.
Or I PM you address and you send me a PDF file of a return label.
I have bought this unit 3 weeks ago, I have a faulty unit and I just want to have a repaired unit that I can use with phantom power.
Actually if I use any condenser microphone of my gear (I have tried with 5 different mics) I have low-frequency noise (no small) in my monitoring system and in the recorded tracks.
I can’t really use this unit with phantom power, neither with my guitars… so the unit is in the box je most of the time.
I just want a simple way to get an operating unit. 