I am very new to SharePoint and am setting up a vacation approval process with a calendar. The workflow works fine for me. But the users who need to be able to "Approve/Deny" the request get "access denied" when trying to either edit the item to change the status, or when using the custom workflow I made that updates the fields in a more user friendly way.
I given the users contribute access to the list and workflow. I have confirmed the issue by having a user request access. Upon granting access the user still could not edit the item.