Not getting email notifications for Bookings with me

Debasish_Thakur I am a Network supervisor at a K12 school system and have a teacher reporting the same issue.  One of my other teachers booked an appointment with her. The person booking the appointment received the confirmation emails but the teacher she was scheduling with did not but she did get the appointment scheduled to her calendar.

I manage our email system so I did an email trace in M365 and do not see any emails to the teacher even attempted to be delivered.  She said it worked in October 2023 though.