Can’t login to POS

I’m having some problems with a client’s site. On my development server I have no problem with the system yet on our client’s shared server I can’t get the plugin to work. Whenever I navigate to mysite.com/pos I get logged out of my account and I can’t log back in. I enter the login information and the page just reloads without me logging in. I have no problem viewing the settings page. Any help?

Using PHP 7.0.33, WC 3.5.2 and the legacy API is active.