How to embed podlove subscribe button?

This sounds easy, but I can’t get it working. I run 2.3.5 podlove publisher and tried pasting this in the content field: [podlove-podcast-subscribe-button]
Also I tried the Subscribe Widget. The description text then is visible, but no subscribe button. is down, so no chance either.

Any ideas?
Best regards,

Can you tell us what exactly is not working and on which web site? is working.

The subscribe button just don’t show up. I expect to see a subscribe button in the widget area I defined.
I like to keep the URL private. Can I send you a private message?