It is very difficult to use Planner and to send invites to others. How do they see the invite on their end? I can find nothing about this process and how to explain this to others.
Here are a few articles from the Help Center that might be helpful:
Helper Resources: The Go-to Page for Helping with Family History
What is Easy Invitations and how do I use it
How do I use the Help Others link in Family Tree?
How to Use the Planner
You may also want to join this group: