I have a form where the initiator selects a user from a people picker field.
once the initiator submits, a flexi task will be assigned to the user selected in the people picker field.
The issue is that when the user open the task, he is able to view but when he clicks on save and submit button, he is receiving "This site has not been shared with you".
Note: the selected user is having contribute access to the list form and to the task list.
and inside the flexi task he is granted edit action