PowerBI Login help

Hi All

we are using hybrid environment. we create users in onprem and migrate to online. i.e Active Directory users are synced to Azure AD. What login to do powerBI takes, Will powerbi takes upn,samaccountname or email address. is there any MS article for this. in the below scenario what login powrbi takes.

upn: user1.john
samaccountname: user1.j
email address: [email protected]