access issues

Hi Rachel Middleton-Smith

I understand you’re repeatedly being asked for an email address, but when you enter it you’re told it’s registered to another account, and you also want the guided alias/account tool and a way to speak with support. Are you seeing “registered to another account” while trying to add this email as an alias, or while trying to sign in with it? 

This usually indicates the email address you’re trying to use is already an alias/sign-in name on a different Microsoft account, and Microsoft does not allow the same alias to be attached to two accounts. See: Add or remove an email alias in Outlook.com - Microsoft Support 

When you can’t sign in or need help managing aliases. Use Change the email address or phone number for your Microsoft account - Microsoft Support 

If you still need to reach Microsoft Support (only chat support vailable for personal account) 

• Visit Contact - Microsoft Support( Only chat support is available for personal account) 
• Type a brief description of your issue in the search box    
• Scroll down to the bottom > select Sign in to contact support    
• Log in to your personal Microsoft account.     
• Under Products & Services, select "Other Products"; Under Categories, select a suitable Category.   
• Click "Chat with a support agent in your web browser" (during business hours) 

Please tell me how it goes. Have a lovely day!   

The message that the email address is already registered usually means that the phone number or email is already an alias on an existing Microsoft account.

To resolve this and get live help:

1. Use the guided alias/account tool
   • Go to the guided tool for Microsoft account aliases and recovery: select Start under “If you can't sign into your Microsoft account, or you've forgotten the email address or phone number used to sign in, use our guided tool below to help you find the correct solution.”
   • This will help identify which account the phone/email is already linked to and what options are available.
2. If still unable to sign in or fix the alias conflict
   • Use the Sign-in Helper for Microsoft accounts if you can’t sign in at all. Enter the email or phone being requested and follow the prompts so the tool can detect and guide the fix.
3. Contact Microsoft support (including phone where available)
   • For Outlook.com and personal Microsoft accounts, open the Outlook.com help experience and scroll to Still need help? → Yes to reach support options (chat or email). If sign-in is not possible, use the separate “If you can't sign in” support entry point.
   • For general Microsoft account and billing issues, use the Account & Billing Help or Get Help entry points. Depending on region and account type, a phone callback option may be offered.
   • If specifically needing a phone number, use the Customer service phone numbers page for Microsoft support. For personal accounts, if a direct phone option is not shown, use the “Get Help” workflow instead.

These official flows are the supported way to both resolve the “already used” email/phone issue and reach an agent (chat or phone, depending on eligibility and region).

References:

• Help with "phone number is already used" in a Microsoft account
• I've forgotten my Skype user name or password
• Outlook prompts for phone number for Outlook.com accounts
• My username and password have stopped working
• I need a phone number for Microsoft support - Microsoft Q&A