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Certificate Error Connecting to Site

I get the following error when trying to connect to any site.

Certificate Error
SharePlus can't validate your server's certificate to ensure a secure channel. Please contact your IT Helpdesk for assistance.

I have no issues connecting via a browser and see no certificate errors that you would expect to see receiving an error like this. I can also connect fine from my mobile browser.

Running the latest android on an S6
Sharepoint is a 2013 environment using then web application proxy to publish the site external.
Example Site URL: