Hi Stephanie,
We are aware that there are customers experiencing issues with Windows RT/8.1 devices connecting to their Microsoft accounts. We're currently working to resolve the issue as soon as possible.
In the meantime, please continue to use your local Windows login account for the time being. You may try to reattach your Microsoft Account as a connected account at a later time.
If you're able to log in to your Surface device using your Microsoft account, we suggest that you try the these solutions that may help you resolve the issue:
Enable the User Account Control.
- Press the Windowskey + W , type “Account Control” in the search bar and press Enter.
- In the “User Account Control" settings window, move the slider to the default settings and click
OK. Once this is done, remember to restart the computer.
Run the Apps Troubleshooter.
To download and run the Modern UI App troubleshooter, click on this link.
Reset the store cache.
- Press the Windows key + R.
- Type: WSReset.exe and click OK.
- Run the tool.
Feel free to post back if you need further assistance.