If you’re using OneNote Class Notebooks, you’ll be pleased to learn that you can mass-generate private links for parents to see the notebooks of their children:
This will let you and the students share evidence of their learning with parents without letting them change anything in the notebooks. You can use an e-mail merge to send out all those logins automatically to parents. Get step-by-step instructions straight from Microsoft: https://support.office.com/en-us/article/Create-parent-and-guardian-links-in-Class-Notebook-b1d7946b-b7a8-41c3-9f86-595e8e2150df