Update:
Ist zwar nur ein Paste and Copy Text vom Support, aber Deutschland scheint nicht mehr akzeptiert zu werden.
"Thank you for contacting Coinbase Support.
Unfortunately at this time, digital currency buys and sells are only available to current residents of the US, Australia, Canada, Singapore and many European countries. You can view a list of fully supported countries here
https://www.coinbase.com/global, and sign up to be notified when we launch in your country.
While I don’t have a specific time at the moment, we are working hard to expand to other countries! Please keep in mind you can still use your Coinbase account as a hosted digital currency wallet to receive, store, and send funds."