If teachers and/or students are receiving an "Access Denied" error when trying to access the Google Slides for the lessons, the domain settings for your school may be preventing users from accessing files shared by people outside of your domain, which is why students and teachers are unable to view materials from Peekapak. To resolve this, your Google administrator would need to adjust the sharing permissions by either:
Allowing users to access publicly shared files from outside domains.
Adding peekapak.com to the Allow List in your domain settings.
If the same issues occur after this is done, please reach out to customer support either by clicking on the orange icon on the bottom right hand corner of the page, or by emailing support@peekapak.com. Please be sure to provide details on the specific slides that you're experiencing the issue with, such as the grade level, unit, lesson that it's under and the name of the slides.