Hi @Stamos, welcome to the community!

If you are getting “invalid tags/variables” - there’s probably something slightly wrong with the code.  Double check for quotation marks, spacing, open and end tags {% %}.  Try testing the link on its own and Copy and Pasting it into the Image URL link field. Or, copy/paste it here and we can take a look at it here.

Here’s also a few other troubleshooting ideas from other threads:

Hope this helps!

Thank you @retention for your reply. 
Links are working now! For anyone interested if must have been an issue of the quotation marks:

Code that doesn’t work:
{% update_property_link ‘Example_Interest’ ‘true’ ‘https://website.com/example’ %}

Code that works:
{% update_property_link 'Example_Interest' 'true' 'https://website.com/example' %}