Dear {Name},
I am so sorry to have missed the deadline for {project}. It's put the rest of the team in a terrible position.
This happened due to {emergency/misunderstanding/poor planning}. But I've now {resolved issue/cleared calendar} and expect to have my portion complete by {timeline}.
Alternately, please let me know if you'd like to see {draft/notes/outline} right away. I want to do everything I can to keep you in the loop and to make up for this inconvenience.
Sincerely,
{Name}
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