Hello, Im trying make notification on new user registration. 
I Made email template, then automated action like on screen shot.

https://i.imgur.com/eJMEWct.png

If I chose Lead?Opportunity as a model - it works
If I chose Users - I can not create a new account through sign up form - it says "Can not create a new account"
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How to fix that?
Second question - how to make noification inside oddo as a message instead of email?