If you have an account on both DE and COM server with the same email, you will be required to change the login of the character coming from DE. This forum post will explain the steps required to do so.
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Step 1:
Go to either domain, warofdragons.de or warofdragons.com. Type in your usual login.
At this stage, you are likely to see the following screen:
Step 2:
On the above screen, click
Cancel or
Aufheben.
This will take you to the following screen:
Step 3:
On the above screen, click
Change or
Andern
Step 4:
This should now take you to a MY.GAMES portal. If you have a login saved here, click
Change Account. You should now be able to
Sign Up with
a new email address.
Step 5:
You should now have an option to click save.
Step 6:
After these steps, your accounts should now be unlinked. You will be able to use your new login for your account from DE and your usual login for your account on COM.