Minecraft Email Showing "N/A"

I was recently trying to grab the email for one of my cousins old minecraft accounts. The authentication response shows:

{"id":"13871733","email":"N/A","username":"PureDrift","secured":false,"emailVerified":true,"legacyUser":true,"verifiedByParent":false,"hashed":true}

The email appears to show "N/A" now. Is there a new way to find the email for my account?