Game keeps signing me out and the password doesn't work to get back in. (Minecraft)

Don't worry.
Now, please reinstall minecraft launcher (if possible, use the one available inside Xbox app) one more time and try sign in again

Don't worry, in that case left-click on it. You should be able to open the services app

Hello! I finished all of this and I'm about to reset the computer now, but I might not be signed out at the moment. Will there be any way I can tell?

Hi and thanks for reaching Microsoft Xbox gamer's community. My name is Josef.

I'm an Independent Advisor and a Microsoft Xbox user like you.

Hope you're doing great today despite this Razorrblade

Here in the public forums no one Microsoft agent or Mojang support can assist you with this process / tell your the specific email / modify or share account details due to privacy and security policies

But I can guide you on this one, first. Is this happening on Windows, Xbox or Phone?

If it's on Windows, which edition are you trying to play. Bedrock or Java?

Just to double check, if you go here, are you able to sign in properly?

https://account.microsoft.com/profile

And, tell me which troubleshooting steps you have done so far to fix this, in that way I can advise you different things

I'll be waiting for your reply, greetings

You're welcome!

Let me know the resolution.

If that doesn't work, I can give you an optional step to do in your machine before asking live support to check your account.

Perform a custom installation for your windows system:

https://answers.microsoft.com/en-us/windows/for...

As I said, is optional. If you don't want to do it, don't worry. That is just to check everything from your side