Open the .csproj file for the iOS app project in a text editor and then add the following lines at the end (immediately before the closing </Project> tag):

<PropertyGroup>
    <CreateIpaDependsOn>
        $(CreateIpaDependsOn);
        CopyIpa
    </CreateIpaDependsOn>
</PropertyGroup>

<Target Name="CopyIpa"
    Condition="'$(OutputType)' == 'Exe'
        And '$(ComputedPlatform)' == 'iPhone'
        And '$(BuildIpa)' == 'true'
        And '$(TF_BUILD)' == 'true'">
    <Copy
        SourceFiles="$(OutputPath)$(IpaPackageName)"
        DestinationFolder="$(TF_BUILD_BINARIESDIRECTORY)"
    />
</Target>

Notes

• This is the same general technique discussed on Can I change the output path of the IPA file?. The two important points are to set $(TF_BUILD_BINARIESDIRECTORY) as the destination folder and to add an extra condition so CopyIpa will only run for TFS builds.

• For a description of TF_BUILD_BINARIESDIRECTORY see https://msdn.microsoft.com/en-us/library/hh850448.aspx.

Additional references

• Documentation on creating TFS build definitions for Xamarin.

• Documentation on installing TFS for use with Xamarin

Next Steps

This document discusses the current behavior as of Xamarin 3.11.666 for Visual Studio and Xamarin.iOS 8.10.3 on the Mac build host. For further assistance, to contact us, or if this issue remains even after utilizing the above information, please see What support options are available for Xamarin? for information on contact options, suggestions, as well as how to file a new bug if needed.