Hi All.
Context
I create a field name "usuario requerido". Its a field of type "user picker". I can add users to this field by their mail.

Then,
I have a security group call "" Tesoreria Mixcoac 1". Into this security group, I add a user custom filed value with the field I create.

This is the ticket with the security group and the field "usuario requerido" with 2 users.

Issue.
After this,
The user I add, can not have access to the ticket. It is assumed that when I add the field to the security group, this user can have access to the ticket but do not have access.
Any idea, what is missing?
Thank you