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1: Apologies for notifying you late of this meeting.

(Context: The meeting invitation was sent late.)

2. Apologies for notifying you late.


Are both grammatically correct?

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fold scarf 1011: Apologies for notifying you late of this meeting.

No. Not good.

e.g.

Apologies for the late notification, but the meeting starts in 10 minutes.

Comments  

I'm not sure of the first one, but the second example sounds correct to my ear. I'd also say:

  • My apologies for the delay in notifying you about this meeting.
  • Apologies for being late to inform you about the meeting.
  • Please accept my apologies for notifying you late about the meeting.
  • My sincerest apologies for not notifying you earlier.

It's better to wait for the teachers' correction.

 AlpheccaStars's reply was promoted to an answer.