Microsoft Remote Desktop Keychain access

Try adding .\ in front of your email address. I'm not familiar with Windows 8, but with previous versions this directs Windows to perform authentication on the local system, rather than on the domain in which it resides.

If this doesn't work, try also hostname\, where hostname is the name of the computer you are trying to log into.

This problem was with the "local items keychain". I found the following here and it worked for me:

Follow these steps to prevent prompts to unlock the Local Items keychain.

1. In Finder Select Go > Go to folder (⇧⌘G)
2. In the window that appears, type the following: ~/Library/Keychains/
3. Click OK.
4. Look for a folder with a name similar to this "A8F5E7B8-CEC1-4479-A7DF-F23CB076C8B8". Note: Each folder has a unique number.
5. Move this folder to the Trash.
6. Immediately choose Apple Menu () > Restart… to restart your Mac.

After restarting the computer, a new folder is created in the Keychains folder with a name similar to "4B29A0BB-599D-47FC-A2D1-42B5592B130B". There is no need to repeat the steps in this article, or to delete this folder. The new folder is expected and corrects the symptom described in this article.