SmtpClientAuthentication is disabled for the Tenant

This error coming from my azure function when sending reply email. I have set scopes as below.

"scopes": [
      "offline_access",
      "email",
      "https://outlook.office.com/IMAP.AccessAsUser.All",
      "https://outlook.office.com/POP.AccessAsUser.All",
      "https://outlook.office.com/SMTP.Send"
    ],
    "replyScopes": [
      "offline_access",
      "email",
      "https://outlook.office.com/IMAP.AccessAsUser.All",
      "https://outlook.office.com/POP.AccessAsUser.All",
      "https://outlook.office.com/SMTP.Send"
    ],

In Azure Active directory I gave below persmion for my app.

• Mail.Read
• MAP.AccessAsUser.All
• Mail.Send
• SMTP.Send
• POP.AccessAsUser.All
• Mail.ReadWrite

But I am getting this error. Anyone have an idea to solve this.

Authentication unsuccessful, SmtpClientAuthentication is disabled for the Tenant. Visit https://aka.ms/smtp_auth_disabled for more information.