Hi @Productology,
1st issue I think is you are doing this on a Signup form. Adding a action that uses logged in user properties after the Signup action doesn’t add them I think due to a current limitation. See here : How to Send Emails with Adalo - Using Integromat & Custom Actions - Tutorial 🤓 - YouTube
You can add this action after Signup on another screen.
The other issue I think is updating linked columns. See this post by Bhanu : When Airtable data is created, subsequent actions are not executed - #4 by bhanu
I think after the create action you would need a Update custom action to update that record linked column.
Update Custom action would be like this :
Thank you