What you should do is use the downloadable recovery image to wipe and reimage. When complete, set it up with your Microsoft Account. See if it activates properly (make sure the time zone and system time are correct and change if needed(. Go to https://support.microsoft.com/en-us/surfacerecoveryimage
(with a different Windows computer if yours is not working properly)
and download a recovery image for your Surface. You will need a 16GB or 32GB USB stick (also called a flash drive) formatted FAT32 (use a Windows computer). You can't use an actual external USB hard drive for this and don't use anything larger than a 32 GB USB stick. Best to purchase and use a new, previously unused USB stick for this. Use FULL format and not quick format and give the volume a name like surfboot. Unzip/extract the recovery zip to the root of the formatted USB stick.
There are full instructions and a video at https://support.microsoft.com/en-us/help/4023512/surface-creating-and-using-a-usb-recovery-drive#download