Solved RAV4 Error in connection

H guys,
PHP 8.1.26 + Joomla 4.4.1 + Helix Ultimate 2.0.18 template (& Cassiopeia, as it is now) + Registrations Account Validation plugin 1.0.0
Registration page on test site

• I installed Registrations Account Validation plugin 1.0.0 and I enabled it
• Joomla Users Manage > Options > User Options > Allow User Registration: Yes
• Joomla Users Manage > Options > User Options > New User Account Activation: None (tested also with “Self”)
• Joomla Users Manage > Options > User Options > Captcha: Aimy Captcha-Less Form Guard (tested also with “None Selected”, as it is now on testing page)

When I click on “Send Code” button, no email is sent out and a writing “Error in coneection” appers below the button. This is an image for you: photos.app.goo.gl/4QehwvpnLKRZfZJK6  

Sure, I tested disabling the RAV4 plugin and the guest can Register with success and the Password Email is sent out as expected.
I also enabled the Debug System / Maximum and any error is shown.

Please, Is there any specific System Ordering plugins I have to take care ?
What am I missing ?

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