Found this when trying OS_AUTH_TYPE="v3oidcpassword"

For anybody using AzureAD as idp in Keystone, it is not OIDC compliant - surprised? keystone will not validate tokens as they are signed for MS graph API essentially it results in "Apache WWW-Authenticate: Bearer error="invalid_token", error_description="JWT token could not be validated" keystone attempts to validate the tokens from the metadata using whatever if finds in https://login.microsoftonline.com/<tenant-guid>/v2.0/.well-known/openid-configurationhttps://login.microsoftonline.com/6edb49c1-bf72-4eea-8b3f-a7fd0a25b68c/v2.0/.well-known/openid-configuration or using an Apache variable in wsgi-keystone.conf called OIDCOAuthVerifyJwksUri for example - it will reach here https://login.microsoftonline.com/<tenant-guid>/discovery/v2.0/keyshttps://login.microsoftonline.com/6edb49c1-bf72-4eea-8b3f-a7fd0a25b68c/discovery/v2.0/keys and find keys - however it won't be able to validate the token as MS inserts a nonce before signing them - i.e. the tokens can only be validated by ms graph additionally, if you try to validate the tokens locally on keystone using Apache variable OIDCOAuthVerifyCertFiles the keys can rotate without warning. The solution is using the app registration portal in Azure and modify the app registration by selecting 'expose an API' and add a scope - then request this scope on the client using apache variable 'OIDCScope' https://medium.com/@abhinavsonkar/making-azure-ad-oidc-compliant-5734b70c43f...

Rob Duncan.

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