N8n: Cannot parse "CRM/Activity" entity "CRM/Email" field

I’m trying to create a new entity (CRM/Activity).

It seems it’s all fine with my data. But I get this error. Anything wrong here from my side?

Looks like the text to be used contains a line break. Could that be the problem?

Nope. For the test sake I’ve “hard coded” the email address. The issue is still there.