The issue is occuring on your Microsoft Surface RT 8.1, correct? Not your Ipad, which runs on iPadOS. Error code 800700E is a Windows Update error which typically occurs on Windows 7. However, if you’re saying the problem is on your Windows 8.1 tablet computer. Then I’d suggest you reset Windows Update. You can do that by using the script shown here: https://www.compuchenna.co.uk/0x80070020/#Run_Reset_Script

If the problem continues to persist after resetting Windows Update, then you can try resetting your OS. keep in mind though, that you will lose all your programs and its data. Alternatively, you can use Reimage to reset your OS. In which case you’ll lose nothing. You can learn more about it here: https://www.compuchenna.co.uk/RE-01/