Redirection to "Thank you" page for my multisite users

Hi guys,

Q&A problem now!

As Super Admin I only see forum. My users don't, automatically send them back to "thank you" page, no matter what roles I assing to anyone.

I need to mention that plugin is not network activated, but just on main site.

If i do activate plugin on network I'm getting message "[Q&A] Visitor role cannot be found. Try to deactivate and reactivate the plugin, if you continue to see this message, consult our Help and Support."

Of course I've checked one post here, and also didn't help: https://premium.wpmudev.org/forums/topic/visitor-role-cannot-be-found-error-message