Can't log in: first checks

Reference only. Follow your organization's IT policies and change process. Each step links its official vendor source.

Windows

1. Basics: Caps Lock, keyboard layout, correct username format, recent password change?
2. Local config: Which account is signed in? whoami Confirms the exact account in use. source
3. Policy: Which group policies apply (domain PCs)? gpresult /r Shows applied policies and groups for the user. source
4. Network: For cloud sign-in: can the PC reach the internet / sign-in service at all? Test-NetConnection login.microsoftonline.com -Port 443 Failed = network, proxy or firewall issue before credentials matter. source
5. Vendor guide: Microsoft: apps that can't sign in to Microsoft 365 source

Mac

1. Escalate: Mac sign-in and managed accounts: follow your organization's account process.

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