Do final user accounts need office 365 licences to use SMTP server?

[Leonardo_Merino]

Hi,
I have an app on Azure AD that requires this scope: https://outlook.office.com/SMTP.SendAsApp from office 365 exchange online API. to access SMTP server, as per documentation (https://learn.microsoft.com/es-es/exchange/client-developer/legacy-protocols/how-to-authenticate-an-...). Will my final users account need to have this API licenced?

[#2]

well I open a new account and try to authenticate. It seems like this is the case