Failed to create subscriber in Omnisend

I wanted to create a Zap but it doesn’t work. Here’s what I want to do: whenever someone signs up through a FB Lead form I want Omnisend to create a new contact. I created a similar Zap for an other FB page also with Omnisend a few weeks ago and it worked.
This is the error that I’m getting:
The app returned `{"message":"Your need to pass phone or email property."} What happened: Executing creates.create_subscribe.operation.perform with bundle {"message":"Your need to pass phone or email property."} Console logs: ` as error, which we cannot read.

Thanks for you help