Xamarin Studio – can not login – One of the identified items was in an invalid format

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Guys from Xamarin Support already post an answer to this
http://forums.xamarin.com/discussion/63675/activation-error/p1

In general you should

Update to the “Cycle 6 – Service Release 3” versions or newer.
The minimum version of Xamarin Studio that supports MSDN licenses is here: http://download.xamarin.com/studio/Mac/XamarinStudio-5.10.3.51-0.dmg

Log out and log back into your Xamarin account following the “Quick manual refresh steps” on https://kb.xamarin.com/customer/en/portal/articles/1641743-how-do-i-manually-resynchronize-xamarin-licenses-.

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