Profile: davidA-16

Problem:
Tell us what you are trying to do?
ensure a user_email field from a register form is saved as lowercase

Is there any documentation that you are following?
https://toolset.com/documentation/programmer-reference/cred-api/#cred_before_save_data

Is there a similar example that we can see?
trying this:

Solution:
The approach you took is correct, I believe the issue might be with the missing 'wpcf' prefix in the field selection.

Can you please try the following code to see if it achieves what you need?