Detailed Steps from Liron Kuchlani:

On admin project by admin user:
===============================

# Create project_a:

(overcloud) [stack@undercloud-0 ~]$ openstack project create project_a
+-------------+----------------------------------+
| Field       | Value                            |
+-------------+----------------------------------+
| description |                                  |
| domain_id   | default                          |
| enabled     | True                             |
| id          | 8c988874e83543cf8b155cf9cfd1356f |
| is_domain   | False                            |
| name        | project_a                        |
| options     | {}                               |
| parent_id   | default                          |
| tags        | []                               |
+-------------+----------------------------------+

# Create user user_a on project_a

(overcloud) [stack@undercloud-0 ~]$ openstack user create --project project_a --password redhat user_a
+---------------------+----------------------------------+
| Field               | Value                            |
+---------------------+----------------------------------+
| default_project_id  | 8c988874e83543cf8b155cf9cfd1356f |
| domain_id           | default                          |
| enabled             | True                             |
| id                  | 7dde343f6ff24f59ba67ce38da3ef9a7 |
| name                | user_a                           |
| options             | {}                               |
| password_expires_at | None                             |
+---------------------+----------------------------------+

# Assign member role to user_a user

(overcloud) [stack@undercloud-0 ~]$ openstack role add --user user_a --project project_a member

# Create private share type on admin project

(overcloud) [stack@undercloud-0 ~]$ manila type-create --is-public False admin-private-share-type False
+----------------------+--------------------------------------+
| Property             | Value                                |
+----------------------+--------------------------------------+
| ID                   | c4ef9a32-b143-4c56-ba71-0a45f4d5848f |
| Name                 | admin-private-share-type             |
| Visibility           | private                              |
| is_default           | -                                    |
| required_extra_specs | driver_handles_share_servers : False |
| optional_extra_specs |                                      |
| Description          | None                                 |
+----------------------+--------------------------------------+

(overcloud) [stack@undercloud-0 ~]$ manila type-access-list c4ef9a32-b143-4c56-ba71-0a45f4d5848f
+------------+
| Project_ID |
+------------+
+------------+

On project_a by user_a user:
============================

# Although the share type does not exist, try to create share with it 

(overcloud) [stack@undercloud-0 ~]$ manila type-show c4ef9a32-b143-4c56-ba71-0a45f4d5848f
ERROR: No sharetype with a name or ID of 'c4ef9a32-b143-4c56-ba71-0a45f4d5848f' exists.

(overcloud) [stack@undercloud-0 ~]$ manila create --name share_member_user cephfs 1 --share-type admin-private-share-type
ERROR: ShareTypeNotFound: Share type c4ef9a32-b143-4c56-ba71-0a45f4d5848f could not be found. (HTTP 404) (Request-ID: req-72638ebe-5a98-448f-941f-fdc7b402982c)

# As you can see, share stuck on "creating" status. The list should be empty.

(overcloud) [stack@undercloud-0 ~]$ manila list
+--------------------------------------+-------------------+------+-------------+----------+-----------+--------------------------+------+-------------------+
| ID                                   | Name              | Size | Share Proto | Status   | Is Public | Share Type Name          | Host | Availability Zone |
+--------------------------------------+-------------------+------+-------------+----------+-----------+--------------------------+------+-------------------+
| 86c8143a-f134-407f-9541-6bc00007dc5f | share_member_user | 1    | CEPHFS      | creating | False     | admin-private-share-type |      | None              |
+--------------------------------------+-------------------+------+-------------+----------+-----------+--------------------------+------+-------------------+

# Now let's try to create a share by share type that does not exist at all.
# Works as expected.

(overcloud) [stack@undercloud-0 ~]$ manila create --name share_member_user cephfs 1 --share-type no_exist
ERROR: Share type not found. (HTTP 404) (Request-ID: req-b3d7fa42-b4ba-4535-80b3-110afa4dc33c)
(overcloud) [stack@undercloud-0 ~]$ manila list
+--------------------------------------+-------------------+------+-------------+----------+-----------+--------------------------+------+-------------------+
| ID                                   | Name              | Size | Share Proto | Status   | Is Public | Share Type Name          | Host | Availability Zone |
+--------------------------------------+-------------------+------+-------------+----------+-----------+--------------------------+------+-------------------+
| 86c8143a-f134-407f-9541-6bc00007dc5f | share_member_user | 1    | CEPHFS      | creating | False     | admin-private-share-type |      | None              |
+--------------------------------------+-------------------+------+-------------+----------+-----------+--------------------------+------+-------------------+