Hello, thank you for reaching out to Microsoft Q&A.
Using the recovery email address, you can only view a partial hint of your Microsoft account email address.
Forgotten your Microsoft account username
First, check whether you recognize the full email address from the partial hint shown on the recovery page.
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If you still cannot remember the email address you used to sign in, see if you are signed in with this account on your Windows PC or any Microsoft services such as Office apps, OneDrive, or Outlook.
You can also ask your friends, family, or colleagues to check whether they have received any emails from you. They may be able to share the exact email address those messages came from.
If that doesn’t help, check whether your credentials for live.com (or other Microsoft domains) are saved in a password manager, such as Microsoft Edge, Google Chrome, or another browser’s password manager. There, you may be able to locate the full username associated with your Microsoft account.