[robertfels]

I've got it. There is an error with the char code of this product.

Solution - Create an new BBCode:
Title:
What you want

Tag:
armory (IMPORTANT: NOT char)

Code:
<a href="http://eu.wowarmory.com/character-sheet.xml?r=Aegwynn&n={param}" target="new" onmouseover='ajax_showTooltip("ajax.php?do=wowchar code&server=Aegwynn&char={param}",this); return false' onmouseout='ajax_hideTooltip()'><strong>&lt;{param }&gt;</strong></a>

Example:
[armory]Klappzwerg[/armory]

Description:
What you want

{option} usage:
OFF

Remove Tag If Empty:
No

Disable BB Code....:
Yes

Disable Smileys....:
Yes

Disable Word Wrapping:
Yes

Change the realm in the code to your default code. With this code its not possible to use another server, but i think you have a guild and your frinds are on the same. If you want it with other server, you should create a second BBCode with {option} enabled and then try to insert that.

Have fun!