Hi,
sorry but I’ve currently disabled the plugin because the website is already live.
@guust: yes, option 1.
I can confirm that main problem on subdomains is loading the modal. I tried also with cache disabled and on different browsers.
I’m using Astra theme + Elementor both on main site and subdomains.
Regarding Social Login, I “solved” adding each subdomain as valid oauth urls on Facebook.
Currently I’m using default wp login system, while for registration I created a simple custom registration form and then activated a 301 redirect from the stock wp-signup.php of the main site to the custom one.
Now when a user does login on any site, he results logged also on other sites.
I also added cookie_domain parameter in wp-config.
Everything is working also with social login (other plugin, not yours, but I think nothing changes, I was simply trying different dolutions), both for login and registration.
I hope these informations will be helpful.
Still waiting for updates because I really like your good looking plugins.