Hi @Tim Nicoll,
Welcome to Microsoft Q&A forum.
I understand you are unable to access your admin account and are facing issues with the Authenticator app. Here are the recommended steps to regain control of your computer.
- Enable the built-in Administrator account via the Windows Recovery Environment.
- On the sign-in screen, hold Shift and select Power > Restart.
- Navigate to Troubleshoot > Advanced options > Command Prompt. Enter
net user administrator /active:yesand restart the computer. - Log in to the Administrator account to manage users or create a local admin account.
- If the Authenticator app prevents a password reset, use alternative verification like SMS or email. If locked out, use the enabled Administrator account to create a Local Account to bypass Microsoft account requirements.
- For a clean installation:
- Use a working computer to download the Windows Installation Media tool and create a bootable USB.
- Boot the target computer from this USB, adjusting BIOS/UEFI settings if necessary.
- Select Custom: Install Windows only (advanced), delete all partitions until the drive shows as Unallocated Space, and click Next.
Regarding reaching out support, I recommend using the Microsoft support portal. This is the dedicated channel for direct support.
- Access the Microsoft support website.
- Describe your issue in the text box provided.
- Follow the screen-prompts to navigate to the specific service you need.
- Select the option to reach out to an agent via chat or phone.
This process is designed to connect you with the appropriate technical team to resolve your account access and installation problems.
Kindly update the outcome to let me further check if the problem persists.