Hi, Orçun Ilbeyli.
Welcome to Microsoft support community.
We noticed you are having problem login to a lot of Microsoft related apps, right? This kind of behavior does seem very annoying and discouraging.
For better solving your problem, may I know:
When you say: "Repaired things via Command Prompt but still no luck", what exactly have you tried in command prompt?
Have you updated the Windows or reinstall it?
You do not have problem visiting website in general, am I correct?
Can you tell if the current account you are using are local account or Microsoft account?
For now, I will suggest you try common fix for this kind of issue first:
Switch to another local account on your computer, this is to exclude the possibility that corrupt account profile (On your current account) might affect your system.
Select Start, select and hold (or right-click) the account name icon (or picture), then select Switch user. If you do not have another account, you could always add one under:
Start > Settings > Accounts ; just remember to choose the local account.
*If you experiencing any difficulty feel free to ask me.
While above solution might not solve your problem instantly, I hope at least it will help you; feel free to keep the situation updated so we could continue investigation. Looking forward about your reply.
Best Regards
Benjamin- MSFT | Microsoft Community Support Specialist