Visual Studio App Deploy Error: DEP0700: Registration of the app failed. [0x80073CFB]

Severity Code Description Project Path File Line Suppression State Error DEP0700: Registration of the app failed. [0x80073CFB] Another user has already installed an unpackaged version of this app. The current user cannot replace this with a packaged version. The conflicting package is 88D96A69-2E7E-4358-A75D-97B980372496 and it was published by CN=[USERNAME]. [APPNAME]

Slowly migrating away from dependance on Microsoft Products

For many decades we have been strictly Microsoft evangelist (where Microsoft had solutions that matched requirements), We became particularly excited when Microsoft announced Windows 10 mobile and Nokia designed mobile devices. Mobile we saw as a positive direction to encompass all our server and desktop efforts with mobile support. We put three years development effort into this direction and Microsoft continued to make positive statements and promised features that gave us confidence to expense time and effort. Customers started purchasing Microsoft phones. The almost overnight, suppliers did not have stock and Microsoft started to drop support for models that where under 12 months old and finally they announced that they have stopped all mobile development.