________ (Name of the School),
________ (Address of the School)
Date: __/__/_____ (Date)
Respected Sir/ Madam,
This is to most humbly inform you that my name is ___________ (name) and I have been teaching ___________ (class/ subject) in your reputed school for __________ (duration).
I write this letter in order to present my sincere apologies for me being absent from the scheduled classes on __/__/____ (date). Respected, the classes were scheduled for __:__ (time) till __:__ (time) but as my internet connection was not working fine, I was unable to join the class.
I apologize for the same and would try to never repeat the same again in the coming future.
_________ (Employee number)