Hi,

My DNN site was DNN 9.2.1
I made my user registration settings to "Use Email Address as Username" on 'Security > Registration Settings' and updated the existing DNN users usernames to their email addresses too. I am trying this first in my development site and there were only 5 users.

Now the registration is not working. But if I disable again "Use Email Address as Username" then it works.

I upgraded the site to DNN 9.3.2 latest version too. Still the problem is same.

I need to use "Use Email Address as Username" for new registrations.

Please, advise me how to fix this.

Note (I am Using Google Authentication and installed Facebook and Twitter. But disabled. I disabled Google Login too and checked. it was same.)

Thank you!

Thank you for helping me to find the solution.

All my registration settings are here.
http://tinyurl.com/y4jlc4ve

I had 3 testing users before. But the client wanted to make the username as his email. So I changed it. When I change it the register button is not working. Nothing happened when I click it. But if I change back to normal, then users can register. Otherwise, the register button is not working.
Tried so many time.

Can not see anything in the admin error log too.

Site is on DNN 9.3.2 and using Porto theme

I appreciate if you can help me to find the issue and to fix it.