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Some of the Web Apps are not visible in the dropdown of the Paste Site Collection tab when trying to create a site collection in Content Matrix.
원인
The problem can be caused by the max site collections for all the content databases present in this web app set to limited number and they were all reached that max level. Hence I could not see in the webapp.
해결 방안
Change the max Site Collection limit in SharePoint, and the Web Apps should now appear in the Content Matrix Console.