[Error] code 2147748619 or 0x80040b0b when Email or Appointment is Saved with certain Contact, Account in Dynamics 365 / CDS

TL;DR version: The user cannot save the Email/Appointment if one of the Recipient/Attendee has an invalid email address.

SYMPTOM

When the user tried to save the Email or Appointment with certain Contact/Account record in Email Recipient/Attendee, the system shows an error messages as below with error message 2147748619 or generic error message and Error code: 0x80040b0b. Once the error message…

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