Note: The following steps must be performed by an Administrator of the Microsoft 365 account that the user belongs to.
Step 1: Login to Microsoft 365 console - https://www.office.com. Go to the Admin center to enable or disable SMTP AUTH on specific mailboxes.
Step 2: Open the Microsoft 365 admin center and go to Users-->Active users
Step 3: Select the user, and in the flyout that appears, click Mail
Step 4: In the Email App section, click Manage Email apps
Step 5: Verify the Authenticated SMTP setting: unchecked = disabled, checked = enabled
Step 6: Click Save
Step 7: The authenticated SMTP must be checked.
If MFA is enabled, then the customer must create an app password to use SMTP.
Step 8: In the NFT marketplace design console, under Custom Domain and Email section, enter the following details:
SMTP Host: smtp.office365.com
SMTP Port: 587
SMTP Username: (your Office365 username)
SMTP Password: (your Office365 password or app password in case MFA is enabled)