Just not working

Did you mean ProfileGrid? https://www.ads-software.com/plugins/profilegrid-user-profiles-groups-and-communities/

If they aren’t using the regular registration hooks, then this plugin won’t be able to help you. But that their OWN tool isn’t working means it’s unlikely any add on will until that’s fixed.

For this plugin, it’s every domain on it’s own line (no commas)

[email protected]
[email protected]

And so on

yes this plugin.
And with frontend registration which I wanted to have.
I wrote them your answer again.

Thank YOu

Only domains do I have to write with @ sign or without?

@kaengu.ru
@siteher.info
@tonne.to
@muellmail.com
@orobasovot.pro
@palmandpeach.com
@betweenscreens.com
@redcloudvapes.com

Only domains do I have to write with @ sign or without?

I would use it WITH, unless people are hammering you with subdomains (like @foo.example.com)