Azure: Moving an App Service to another existing App Service Plan
<p>I'm attempting to move an App Service from one service plan to another.  When I use the portal to do so, the other App Service plan is not displaying. </p>

<p>Both App Services are in the same Location and Resource Group.
The two App Services Plans are in the same location and have the same pricing tier.</p>

<p>I use the "Change App Service Plan" option for the web app.  The only App Service Plan that is displayed is the current one. There is also a "Create New" option.</p>

<p>So, in summary:
1) Why is the other App Service Plan not able to be selected.
2) How can I move the App Service (Web App) to the other App Service Plan.</p>