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I was having this problem and it was caused by the Play Services Resolver that I had imported. The Play Services Resolver I was using comes with...
Yes command prompt should be started as Admin. And yes, somewhere else somebody made the suggestion of starting Unity as Administrator.
I guess, because it is updating the android sdk independently. Search the path in your Unity version.
I ran the sdkmager.bat on a Windows console (as administrator) located in C:\Program...