[Python] Authlib Oauth2 Azure ssl error "The request body must contain the following...

I am trying to use Authlib 1.5.1 to authenticate against backend, using Azure as an authentication provider. My configuration is simple, I'm trying to follow docs:

oauth.register(
'azure',
server_metadata_url=app.config['AZURE_METADATA_URL'],
client_id=app.config['AZURE_CLIENT_ID'],
client_secret=app.config['AZURE_CLIENT_SECRET'],
client_kwargs={
'scope': 'api://XXXXX0-YYYYY-ZZZZZZZZZZZZZ/api.access',
}
)


Flask app config file is simple as well:

import os
from config_reader import config

TENANT_ID = 'XXXXX0-YYYYY-ZZZZZZZZZZZZZ'
AZURE_CLIENT_ID = os.getenv("AZ_CLIENT_ID")
AZURE_CLIENT_SECRET = os.getenv("AZ_CLIENT_SECRET")
AZURE_AUTHORITY = f'https://login.microsoftonline.com/{TENANT_ID}'
AZURE_REDIRECT_URI = config['callback_url']
AZURE_ACCESS_TOKEN_URL = f'https://login.microsoftonline.com/{TENANT_ID}/oauth2/v2.0/token'
AZURE_AUTHORIZE_URL = f'https://login.microsoftonline.com/{TENANT_ID}/oauth2/v2.0/authorize'
AZURE_API_BASE_URL = config['api']['url']
AZURE_METADATA_URL = f'https://login.microsoftonline.com/{TENANT_ID}/v2.0/.well-known/openid-configuration'


Variables seems to be propagated properly, but on oauth.azure.authorize_access_token() I am getting error

authlib.integrations.base_client.errors.OAuthError: invalid_request: AADSTS900144: The request body must contain the following parameter: 'client_id'.


What am I missing?

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