I'm pretty sure the reason your teacher said "no" is because trans fat is CURRENTLY being banned. It's not yet removed entirely, but the laws are in place for them to be.
(So I've heard from people. I'm not sure if this is accurate, but you could probably find out with a quick google search).
Hope this helped :)
My personal recommendations would be to
A ) Make the subject shorter, like "Reason for Absence" or "My Absence"
B ) Make the email more formal. (You don't have to copy my recommendation word for word but if you want to or use it for reference that works):
"Good Morning/Afternoon/Evening Mrs. __,
I hole you're have a lovely morning/afternoon/evening. Today I was absent and I apologize for the inconvenience. The class meeting didn't appear on my canvas courses and I couldn't find a zoom link. If there's anywhere I can find either one for the future please let me know and again I'm sorry for the inconvenience.
Sincerely,
__"
