Hi– thanks for using Force Login!
Are there any errors that you’re getting?
Have you contacted support at ManageWP for any insight into what is causing this conflict?
How exactly does ManageWP “auto-login” work?
I assume they use the REST API to manage your site, which Force Login restricts access to authorized users only.
Try one of the following code snippets to allow the WP REST API to be publicly accessible again and see if that resolves the issue:
add_filter( 'rest_authentication_errors', '__return_true' );
Or
remove_filter( 'rest_authentication_errors', 'v_forcelogin_rest_access', 99 );