Good Afternoon,
It has come to our attention that there is a Authentication error when users attempt to update their MTH DCS Wifi App through the UPGRADE feature on the app (in-app purchase). The problem that is occurring is on Google's end. They are rolling to a new distribution system for their Play Store today, April 18, 2017. This is the cause of the error you are all seeing.
Resetting the app, logging out/in to Google will not correct the issue. Google will have to correct the issues they are having on their end in order to correct this. MTH has released the app to Google and it's sitting there, it's just that Google is having some issues presently.
As soon as we have word that it's working (and we suspect that some of you will continue to try upgrading as the day progresses) we will post back on this thread. Likewise, if anyone is attempting to upgrade from the Standard App to the Premium App and has success (no telling how long it will take Google to fix their issue) please post your success on this thread.
Thank you to those that have reported this. We are excited that there is so much interest in the new Premium App and we're sure you'll enjoy it once Google fixes their issue.
MTH