Users can't sign in due to 403 error

My users just started seeing “403 Unknown Error” when trying to log in. I followed these instructions - but I’m now getting an error in the admin settings: " * Your website is using SSL. But [force_https](https://movermaker.com/admin/site_settings/category/all_results?filter=force_https) is not yet enabled in your site settings."

I am using the Digital Ocean app setup with nothing custom, and ‘v2.0.0.beta2 +170’. Is this because I’m using a beta version?