I have created a custom SharePoint list as a private list. I am the only user that has full control on that list. I have 6 test items on that list and have created a basic PowerApps form for the list. As an owner if I open it I can see the list items through the form.
I share 1 item with a test user and send an email to them. When they open the link, the form tries to load and then they get a "you dont have permission for this app". They can request permission and as a owner I get the request email, but the PowerApps site has an issue loading the permissions page.
If the test user goes back on the breadcrumb of the list, then they can see list and the only item that has been shared with them.
We are all on the same tenant but is there is a reason why the test user cannot see the form?
Dhiran