MSBUILD : error MSB1008: Only one project can be specified

It turns out the trailing slash in the PublishDir property is escaping the end quote. Escaping the trailing slash solved my problem.

/p:PublishDir="\\BSIIS3\c$\DATA\WEBSITES\benesys.net\benesys.net\TotalEducationTest\\"

This way we can use quotes for paths that have whitespace in properties that MSBuild requires the trailing slash.

I know this is an old post, but I feel like I needed to share this with someone :-)

This problem appears when you have a path or a property containing a space and that is not quoted.

All your properties and path have quote around them, it's strange. The error message indicates Education as a switch, try to remove /p:ProductName="Total Education TEST" to see if it works.

On Git Bash I had to specify the parameters with double slashes like:

MSBuild.exe "Path\to\Solution.sln" //p:Platform="x86" //p:Configuration=Release //p:AppxBundlePlatforms="x86" 

SOLUTION
Remove the Quotes around the /p:PublishDir setting

i.e.
Instead of quotes

/p:PublishDir="\\BSIIS3\c$\DATA\WEBSITES\benesys.net\benesys.net\TotalEducationTest\"  

Use no quotes

/p:PublishDir=\\BSIIS3\c$\DATA\WEBSITES\benesys.net\benesys.net\TotalEducationTest\  

I am sorry I did not post my finding sooner. I actually had to research again to see what needed to be changed. Who would have thought removing quotes would have worked? I discovered this when viewing a coworkers build for another solution and noticed it did not have quotes.