Previously we were able to get all fields for a particular project (categorized by issueTypes) through this API :
/rest/api/2/issue/createmeta?projectKeys=SC&expand=projects.issuetypes.fields
We need something similar (this seems to be deprecated) and this particular API didn't return me the "Assignee" field despite the issue having an assignee field.
We have ASSIGN_ISSUES access:
"ASSIGN_ISSUE": {
"id": "13",
"key": "ASSIGN_ISSUE",
"name": "Assign Issues",
"type": "PROJECT",
"description": "Ability to assign issues to other people.",
"havePermission": true,
"deprecatedKey": true
}