Can't sign in at Blue screen for PC repair

[Windows 10]

PC starts up, trys to repair, and it can't, I get bsod 0cx000021a. Eventually goes to blue repair screen. In order to use all the repair options I have to sign in. I use my up to date password that works on my smartphone, but for some reason it won't recognize on this PC. I tried using a usb with with windows install files on it to do a repair with it. The command prompt with various commands, some worked some I didn't have permission to use. Didn't work. So how do I make it accept my up to date password to fix this? Is there a work around? It has windows 10.

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