I have the same exact issue. Surface RT is totally useless without a Microsoft account connected to it:
According to Microsoft Lifecycle Policy, Windows RT is currently under support:
| Products Released | Lifecycle Start Date | Mainstream Support End Date | Extended Support End Date | Service Pack Support End Date | Notes |
|---|---|---|---|---|---|
| Windows RT | 10/30/2012 | Not Applicable | Not Applicable | 01/12/2016 | Customers have 24 months to move to Windows RT 8.1 after General Availability in order to remain supported. See the Windows 8.1 FAQ for more information. |
| Windows RT 8.1 | 11/13/2013 | 01/09/2018 | 01/10/2023 | The product falls under the same lifecycle policy as Windows 8 with support ending 1/10/2023. <br>However, customers have 24 months to move to Windows 8.1 after General Availability in order to remain supported. <br>See the Windows 8.1 FAQ for more information. |
To me, a reply from Microsoft stating that they aware on the issue an there will be a fix somewhere in the future, without any serious commitment is totally unacceptable. I am deeply disappointed from MS support to their products. I have issues with a Microsoft Band 2 and a Lumia 950 XL phone, an now my Surface RT is nothing but an expensive paperweight. For me, this is the last nail in the coffin I needed as a loyal and enthusiastic Microsoft customer. Its is clear to me now that after a couple years, any Microsoft branded device will be abandoned by the company. Shame on you, Microsoft!