Sharing Planner No Longer Useful

My team and I used to always share our common curriculum links with each other and our students. This made it easy for use to collaboratively plan and for our students to see missing work. But this is not longer a viable option.

Now, when I click on the link to my teammate's planner I cannot navigate to any date. I'm stuck at the first week of school.

Is there a different way to share the link or can this function be reinstalled?

Thank you!