HELP! Site not accessible. I can access it at home but lots of customers can't access it.

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My website is not accessible by most clients/servers. I realised I can access it at home, but can't access it at work. Also, I was hoping to work with a developer for some updates, and he also could access the site, or even login.
While trying to login, I get stuck at this page and Url. Please help!!!

Screenshot 2020-05-11 at 10.03.34 AM.png