Viewport argument value "device-width;" error in iOS inspector

I've been having an issue with my mobile app redirecting to a blank white screen when I try to use Azure's mobile service OAuth. It only occurs when running on the actual device.

It's an Ionic/Cordova app and I'm trying to authenticate through Azure's mobile services. I get this error when I inspect the app running on my phone through safari's page inspector:

Viewport argument value "device-width;" for key "width" is invalid, and has been ignored. Note that ';' is not a separator in viewport values. The list should be comma-separated.

Here's the code, I think that the semi-colons should be comma's, but I'm not really sure how to fix that because this is the authentication page generated when I make the call to the mobile service.

<meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0;">

Any suggestions would be appreciated.