Direct SMTP from scanners - Send to email

Hello,

We have historically been setting up our scanners for customers using the SMTP AUTH through a mailbox, such as 'email address removed for privacy reasons' (As the link below). This has stopped working when MFA is then enabled on the organisation. The work around is to disable security defaults and then enable MFA on each of the individual mailboxes which is obviously quite cumbersome. 

https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365#option-1-authenticate-your-device-or-application-directly-with-a-microsoft-365-or-office-365-mailbox-and-send-mail-using-smtp-auth-client-submission

After playing around with Azure Communication Services and setting that up to send emails which work but then the username is too long for a lot of the scanner's interfaces. 

What's the best way that people are setting up their scanners to send to email with Security Defaults enabled on their organisation?

Many thanks,

Luke