when ever i log into my microsoft account on anything(xbox ,microsoft store) it always say...

Thank you for contact us! I'm Anderson, an Independent Consultant and a Microsoft user like you.

good evening

I'd be happy to help you resolve this issue.

Here are a few steps you can try to fix the problem:

Check for typos: Make sure that you are typing your password correctly.

Reset your password: If you've forgotten your password, you can reset it by going to the Microsoft account password reset page.

Use the "remember me" option: If you're signing in on a device that you trust, you can select the "Remember me" option to make signing in easier in the future.

Clear your browser cache: Clearing your browser cache can sometimes resolve sign-in issues.

Try signing in on a different device: If the issue persists, try signing in on a different device to see if the problem is with the device you're using.

So I logged out of the Microsoft account, I attempted to log in with my old Mojang account, it failed, and then I logged back in with my Microsoft account.

And, again, I'm on Linux. I have no Microsoft Store. Tried looking at the Microsoft Store website, but I didn't get anything useful from there either.

Ok, so i completed all of the tasks and restarted my computer. Upon opening the Microsoft store I was already logged in on the wrong account. I tried logging out and back in on the Microsoft store but any attempt to log into my Xbox account just cancels the log-in attempt and it doesn't log in to anything. I tried logging into my Xbox app and gamer bar but same issue as before

No, however it would only ever let me log in using the Microsoft account. But it would say I'm logged in twice, once with my Microsoft account and then I'd click on the account I had for Minecraft and log in using the Microsoft pop-up.

unless you log in to an xbox console it will never sync to your epic account, you would need to get a refund and then purchase via the epic store or in game.

anything to do with fortnite on pc is best dealt with via epic store or in game as it has nothing to do with Microsoft what so ever when on PC.