I am setting up Xamarin with Team Foundation Service + git to develop iOS apps. I have tried many different settings trying to set up my TFS +
In step 12. on Windows 8 and you entered the wrong password you will have to fix it in Credential Manager.
In windows 8
In Control Panel, Open Credential Manager, On the top of the page you have two options, select "Windows Credentials". Under "Generic Credentials" look for a record for "your.visualstudio.com" click to expand and select remove. Now if you publish from Xamarin Studio you will be prompted for your password again.