I'm trying to use openID with 
openstack --versionopenstack 5.2.0

keystoneauth1==3.17.3
keystonemiddleware==7.0.1
python-keystoneclient==3.21.0

I have created an RC file like so :

export OS_INTERFACE="public"
export OS_AUTH_URL="https://openstack:5000/v3"
export OS_IDENTITY_PROVIDER="<my_idp>"
export OS_PROTOCOL="openid"
export OS_CLIENT_ID="<the -id >"
export OS_CLIENT_SECRET="<the secret>"
export OS_DISCOVERY_ENDPOINT="https://login.microsoftonline.com/<the-tenant-id>/v2.0/.well-known/openid-configuration"
export OS_IDENTITY_API_VERSION="3"
export OS_AUTH_TYPE="v3oidcpassword"
export OS_USERNAME="<AzureAD user>"
# this is the local openstack project id
export OS_PROJECT_ID="<The project ID>"
# set password by querying user
export OS_PASSWORD=""
echo "Please enter your O365 Password: "
read -sr OS_PASSWORD_INPUT
export OS_PASSWORD=$OS_PASSWORD_INPUT

all is working on Horizon  WebSSO- but I cannot access the API
the openstack --debug output shows that I get a token from MS 

debug info (redacted)


command: token issue -> openstackclient.identity.v3.token.IssueToken (auth=True)
Auth plugin v3oidcpassword selected
auth_config_hook(): {'api_timeout': None, 'verify': True, 'cacert': None, 'cert': None, 'key': None, 'baremetal_status_code_retries': '5', 'baremetal_introspection_status_code_retries': '5', 'image_status_code_retries': '5', 'disable_vendor_agent': {}, 'interface': 'public', 'floating_ip_source': 'neutron', 'image_api_use_tasks': False, 'image_format': 'qcow2', 'message': '', 'network_api_version': '2', 'object_store_api_version': '1', 'secgroup_source': 'neutron', 'status': 'active', 'auth': {'project_id': '516706052ebd4f9a89c0b7d7e075754d'}, 'additional_user_agent': [('osc-lib', '2.0.0')], 'verbose_level': 3, 'deferred_help': False, 'debug': True, 'default_domain': 'default', 'timing': False, 'auth_url': 'https://openstack.*********:5000/v3', 'username': 'r********', 'password': '***', 'identity_provider': '*****', 'protocol': 'openid', 'client_id': '*******', 'client_secret': '***', 'discovery_endpoint': 'https://login.microsoftonline.com/*******/v2.0/.well-known/openid-configuration', 'beta_command': False, 'identity_api_version': '3', 'data_processing_api_version': '1.1', 'container_infra_api_version': '1', 'region_name': '', 'auth_type': 'v3oidcpassword', 'networks': []}
Using auth plugin: v3oidcpassword
Using parameters {'auth_url': 'https://openstack.******:5000/v3', 'project_id': '516706052ebd4f9a89c0b7d7e07575, 'identity_provider': '*****', 'protocol': 'openid', 'client_id': '********', 'client_secret': '***', 'discovery_endpoint': 'https://login.microsoftonline.com/*******/v2.0/.well-known/openid-configuration', 'username': '*****', 'password': '***'}
Get auth_ref
REQ: curl -g -i -X GET https://login.microsoftonline.com/*****/v2.0/.well-known/openid-configuration -H "User-Agent: openstacksdk/0.46.0 keystoneauth1/4.0.0 python-requests/2.22.0 CPython/3.8.2"
Starting new HTTPS connection (1): login.microsoftonline.com:443
https://login.microsoftonline.com:443 "GET /******/v2.0/.well-known/openid-configuration HTTP/1.1" 200 1651
RESP: [200] Access-Control-Allow-Methods: GET, OPTIONS Access-Control-Allow-Origin: * Cache-Control: max-age=86400, private Content-Length: 1651 Content-Type: application/json; charset=utf-8 Date: Wed, 21 Oct 2020 09:37:13 GMT P3P: CP="DSP CUR OTPi IND OTRi ONL FIN" Set-Cookie: fpc=AhupGfLmUQlEsKNlR-m0ATg; expires=Fri, 20-Nov-2020 09:37:14 GMT; path=/; secure; HttpOnly; SameSite=None, esctx=*****: domain=.login.microsoftonline.com; path=/; secure; HttpOnly; SameSite=None, x-ms-gateway-slice=estsfd; path=/; secure; samesite=none; httponly, stsservicecookie=estsfd; path=/; secure; samesite=none; httponly Strict-Transport-Security: max-age=31536000; includeSubDomains X-Content-Type-Options: nosniff x-ms-ests-server: 2.1.11154.9 - NEULR2 ProdSlices x-ms-request-id: 0819033b-dcb3-409a-8115-54dc06a31900
RESP BODY: {"token_endpoint":"https://login.microsoftonline.com/*****/oauth2/v2.0/token","token_endpoint_auth_methods_supported":["client_secret_post","private_key_jwt","client_secret_basic"],"jwks_uri":"https://login.microsoftonline.com/****/discovery/v2.0/keys","response_modes_supported":["query","fragment","form_post"],"subject_types_supported":["pairwise"],"id_token_signing_alg_values_supported":["RS256"],"response_types_supported":["code","id_token","code id_token","id_token token"],"scopes_supported":["openid","profile","email","offline_access"],"issuer":"https://login.microsoftonline.com/****/v2.0","request_uri_parameter_supported":false,"userinfo_endpoint":"https://graph.microsoft.com/oidc/userinfo","authorization_endpoint":"https://login.microsoftonline.com/****/oauth2/v2.0/authorize","device_authorization_endpoint":"https://login.microsoftonline.com/*****/oauth2/v2.0/devicecode","http_logout_supported":true,"frontchannel_logout_supported":true,"end_session_endpoint":"https://login.microsoftonline.com/****/oauth2/v2.0/logout","claims_supported":["sub","iss","cloud_instance_name","cloud_instance_host_name","cloud_graph_host_name","msgraph_host","aud","exp","iat","auth_time","acr","nonce","preferred_username","name","tid","ver","at_hash","c_hash","email"],"tenant_region_scope":"EU","cloud_instance_name":"microsoftonline.com","cloud_graph_host_name":"graph.windows.net","msgraph_host":"graph.microsoft.com","rbac_url":"https://pas.windows.net"}
REQ: curl -g -i -X POST https://login.microsoftonline.com/******/oauth2/v2.0/token -H "User-Agent: openstacksdk/0.46.0 keystoneauth1/4.0.0 python-requests/2.22.0 CPython/3.8.2" -d '{'username': '*****', 'password': '*****', 'scope': 'openid profile', 'grant_type': 'password'}'
https://login.microsoftonline.com:443 "POST /*****/oauth2/v2.0/token HTTP/1.1" 200 3764
RESP: [200] Cache-Control: no-store, no-cache Content-Length: 3764 Content-Type: application/json; charset=utf-8 Date: Wed, 21 Oct 2020 09:37:14 GMT Expires: -1 P3P: CP="DSP CUR OTPi IND OTRi ONL FIN" Pragma: no-cache Set-Cookie: fpc=****; expires=Fri, 20-Nov-2020 09:37:14 GMT; path=/; secure; HttpOnly; SameSite=None, x-ms-gateway-slice=estsfd; path=/; secure; samesite=none; httponly, stsservicecookie=estsfd; path=/; secure; samesite=none; httponly Strict-Transport-Security: max-age=31536000; includeSubDomains X-Content-Type-Options: nosniff x-ms-ests-server: 2.1.11154.9 - WEULR1 ProdSlices x-ms-request-id: 92d66fde-6763-4be2-b1cf-00fd18bc1800
RESP BODY: {"token_type":"Bearer","scope":"email openid profile 00000003-0000-0000-c000-000000000000/User.Read","expires_in":3599,"ext_expires_in":3599,"access_token":"<the access token>","id_token":"<the id token>"}
REQ: curl -g -i -X POST https://openstack***:5000/v3/OS-FEDERATION/identity_providers/***/protocols/openid/auth -H "Authorization: {SHA256}aff774c8663ee647a08aefcea698f8c30e1d1cc8d85a3d55a17cae53defd8955" -H "User-Agent: openstacksdk/0.46.0 keystoneauth1/4.0.0 python-requests/2.22.0 CPython/3.8.2"
Starting new HTTPS connection (1): openstack.****:5000
https://openstack.***:5000 "POST /v3/OS-FEDERATION/identity_providers/****/protocols/openid/auth HTTP/1.1" 200 541
RESP: [200] Content-Length: 541 Content-Type: text/html Date: Wed, 21 Oct 2020 09:37:14 GMT Server: Apache
RESP BODY: Omitted, Content-Type is set to text/html. Only application/json responses have their bodies logged.
Expecting value: line 1 column 1 (char 0)
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/cliff/app.py", line 393, in run_subcommand
    self.prepare_to_run_command(cmd)
  File "/usr/lib/python3/dist-packages/osc_lib/shell.py", line 493, in prepare_to_run_command
    self.client_manager.auth_ref
  File "/usr/lib/python3/dist-packages/osc_lib/clientmanager.py", line 202, in auth_ref
    self._auth_ref = self.auth.get_auth_ref(self.session)
  File "/usr/lib/python3/dist-packages/keystoneauth1/identity/v3/federation.py", line 65, in get_auth_ref
    auth_ref = self.get_unscoped_auth_ref(session)
  File "/usr/lib/python3/dist-packages/keystoneauth1/identity/v3/oidc.py", line 265, in get_unscoped_auth_ref
    return access.create(resp=response)
  File "/usr/lib/python3/dist-packages/keystoneauth1/access/access.py", line 36, in create
    body = resp.json()
  File "/usr/lib/python3/dist-packages/requests/models.py", line 897, in json
    return complexjson.loads(self.text, **kwargs)

what's gone wrong?

thanks,
Rob.

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