Hi!
I create logic flow to connect my form with mailierlite. Step by step with this tutorial: Add Subscribers to MailerLite, Using Logic | Sygnal-U
My test return me:
My site: https://www.wellbeingprofessor.com/
Help me please 
Hi Maja, unfortunately even if you shared your readonly designer link, we wouldn’t be able to see much in a Logic flow.
Based on the error, it looks like your Mailerlite API key isn’t set or perhaps isn’t in the correct place. You might redo that part of the tutorial and the setup in Mailerlite to check everything,
My API is ok, I repet API 3 times.
Okey, I give up and convert to maichimp.
Thanks!
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Hahaha cool, good luck.