Elementor Pro Activation issue

The Elementor Pro license was Cancelled and I got a new subscription. I uploaded the new downloaded plugin version on WP, but when I am trying to Connect&Activate I am redirected to a weird page that is only saying “Security check error” without any other information in the console.

PS: I don’t know if it is related, but I also noticed that I am not able to install new plugins from WP directly, the plugins are just loading endlessly and never installed.

Already contacted Elementor support a lot of times, they told me to follow the same steps I described above…tried to deactivate plugins, everything is up to date.

I appreciate any suggestion at this point as it is been weeks since I am stuck on this problem. Thank you!