change usergroup self service

Hi everyone, I have resumed the development of my project currently on local and closed domain. I tried to create a way to make a normal registered user (normal user) if he goes to settings-->preferences-->do you want to be a blogger? -->YES --> the user doesn't change user group, can anyone explain to me why?

what I did:

1 I created a custom field

DO YOU WANT to be a blogger: single choice: YES - NO required upon registration YES.

2 I created the blogger user group

3 I created a...

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