Has anyone had success connecting a MFP to send email to office 365? I have basic authentication enabled and the ECP url setup. I just can't seem to get it to connect.
I use a Connector in M365 to allow inbound mail from the WAN IP address of my client who needs to send. Then I have the network copier/scanner/printer (Xerox C8135 and others) send directly to M365. See https://docs.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
I used Option 3 because they have Microsoft Security Defaults and multi-factor authentication (MFA) enabled.
Note that to use STARTTLS, your MFP has to support TLS 1.2 level.