Dear Denise,
Thanks for your updates.
From your description, it seems that you send the meeting notes from Outlook to OneNote. If yes, when you use the When a new page is created in a section trigger, the flow should be triggered.


Here is a demo for your reference. For example, you want to extract meeting1 and please complete task for the task title. Yoy can create the flow in your environment as follows.



Compose2: split(outputs('Compose'),',')
Compose3: first(outputs('Compose_2'))
Compose4: substring(outputs('Compose_3'),8,sub(lastIndexOf(outputs('Compose_3'),'Link'),8))
Compose5: last(outputs('Compose_2'))
Compose6: replace(outputs('Compose_5'),decodeUriComponent('%0A'),' ')
Compose7: lastindexof(outputs('Compose_6'),'Notes')
Compose8: add(int(indexOf(outputs('Compose_6'),' ')),3)
Compose9: substring(outputs('Compose_6'),outputs('Compose_8'),sub(outputs('Compose_7'),outputs('Compose_8')))
Result:

Thanks for your effort and time!
Sincerely,
Cliff | Microsoft Community Moderator