This support ticket is created 6 years, 7 months ago. There's a good chance that you are reading advice that it now obsolete.
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2. The following code does not work at all. It displays nothing
[wpv-conditional if='( has_term() eq 'ventilatoren' )']
<h1>TESTING VENTILATOREN TERM</h1>
[wpv-view name='artikel-specificaties']
[/wpv-conditional]
Glad to know that you are able to display conditional output using taxonomy terms.
No - I do not have any idea why its not working with "WooCommerce Tag Manager Plugin". You may create a new ticket and share all required information and we are happy to help you further and we will try to check why its not working with the said plugin.
This will help other users searching on the forum. Thank you for understanding.