Project member is unable to create a container

- focal-ussuri, 20.10
- python3-swiftclient 1:3.9.0-0ubuntu1.1 from focal-proposed installed in openstack-dashboard units.
- swift is not deployed
- ceph-radosgw is deployed

A user with a role 'member' (note lowercase 'm') assigned in the project in not able to create a container.

Probably related to: https://bugs.launchpad.net/charm-ceph-radosgw/+bug/1902944

$ openstack container create my-container
Unauthorized (HTTP 401) (Request-ID: tx0000000000000000004cb-005fae64e4-435e-default)

In the Horizon GUI, a user with 'member' role in the project is not able to access "Object Store -> Containers" tab at all. As soon as I click "Containers", I'm being logged out and dropped to login page.

The log from ceph-radosgw unit.

2020-11-13T10:35:57.420+0000 7f8eb1ffb700 1 ====== starting new request req=0x7f8eb1ff45c0 =====
2020-11-13T10:35:57.732+0000 7f8eb1ffb700 0 req 4 0.311998666s swift:create_bucket user does not hold a matching role; required roles: Member
2020-11-13T10:35:57.732+0000 7f8eb1ffb700 1 op->ERRORHANDLER: err_no=-1 new_err_no=-1
2020-11-13T10:35:57.732+0000 7f8eb1ffb700 1 ====== req done req=0x7f8eb1ff45c0 op status=0 http_status=401 latency=0.311998666s ======
2020-11-13T10:35:57.732+0000 7f8eb1ffb700 1 civetweb: 0x7f8f884e8010: 127.0.0.1 - - [13/Nov/2020:10:35:57 +0000] "PUT /swift/v1/AUTH_73152ea5aba64729a406147301a1118b/mycontainer HTTP/1.1" 401 321 - openstacksdk/0.36.0 keystoneauth1/3.17.1 python-requests/2.22.0 CPython/3.6.8

$ env | grep OS_
OS_USER_DOMAIN_ID=9a87cc9d77b846ffaa2b7fd9c5f6c515
OS_AUTH_URL=https://keystone.example.com:5000/v3
OS_PROJECT_DOMAIN_ID=9a87cc9d77b846ffaa2b7fd9c5f6c515
OS_DOMAIN_ID=9a87cc9d77b846ffaa2b7fd9c5f6c515
OS_REGION_NAME=RegionOne
OS_PROJECT_NAME=test-workload-project
OS_IDENTITY_API_VERSION=3
OS_AUTH_TYPE=password
OS_INTERFACE=public
OS_PASSWORD=redacted
OS_USERNAME=project-member

$ juju ssh openstack-dashboard/0 "dpkg -l python3-swiftclient | grep python"
ii python3-swiftclient 1:3.9.0-0ubuntu1.1 all Client library for Openstack Swift API - Python 3.x