"rcmobile" URI Scheme Doesn't Work with Mac OS X Desktop App

Observed Behaviour:

When clicking on a "rcmobile" Ring Out link as documented in the developer portal, the RingCentral app opens, but the number from the link does not get populated in the app, and a call is not placed.

Expected Behaviour:

When clicking the Ring Out link from the example code below, the RingCentral sales number is called.

This have been observed with:

• OS: macOS Sierra 10.12 (16A323)
• RingCentral App: 8.2.1.22660 (64-bit), 8.3.4.24012 (64-bit)
• Browsers: Firefox 49.0.1, Chrome 53.0.2785.116 (64-bit), Safari 10.0 (12602.1.50.0.10)

This does function as intended on the iPhone using iOS 10.0.3 and RingCentral 8.3.0.

HTML Sample for Testing:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "" target="_blank">http://www.w3.org/TR/html4/loose.dtd">;
<html lang="en">
  <head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <title>Ring Central Desktop Link</title>
  </head>
  
  <body>
    <h1>Click to Call</h1>
    <div>
      <p>
        <a href="rcmobile://call?number=08000988136">RingCentral Sales Number</a>
      </p>
    </div>
  </body>
</html>