compute_client_args ignores scoped_config properties - botocore.exceptions.NoRegionError

[p2safu]

Describe the bug

My issue arise when I try to create an Athena client using boto3.client()

The function is executed like this: boto3.client('athena', endpoint_url=None)
Digging into the boto code, I see that at some point it reads AWS config file and populates a variable called scoped_config with the valid values.

When execution reaches compute_client_args() the parameters are:

client_config=None
region_name=None
endpoint_url=None
is_secure=True
scoped_config={
    "output": "json",
    "sso_account_id": "111111111",
    "sso_region": "eu-west-1",
    "sso_role_name": "ViewOnlyAccess",
    "sso_session": "test-session"
}

The error botocore.exceptions.NoRegionError: You must specify a region. is thrown later, from the self._compute_endpoint_config()

What I would expect, is that if region is not defined then it would be derived from the AWS config file (from scoped_config variable)

I have aws config file with session profile that looks like this:

[sso-session  test-session]
sso_start_url = https://test.awsapps.com/start
sso_region = eu-west-1
sso_registration_scopes = sso:account:access

[profile rnd]
sso_account_id = 111111111
sso_role_name = ViewOnlyAccess
sso_session = test-session
output = json

Anything else, like s3 and dynamo, when initialized using boto3.resource() opens connection successfully.

Expected Behavior

region is populated from the scoped_config when undefined explicitly

Current Behavior

Fails on botocore.exceptions.NoRegionError: You must specify a region.

Reproduction Steps

Simple main like this:

if __name__ == '__main__’:
  client = boto3.client('athena', endpoint_url=None)

Possible Solution

No response

Additional Information/Context

No response

SDK version used

1.28.40

Environment details (OS name and version, etc.)

Mac OS Ventura 13.5.2, Python 3.7.9, botocore 1.31.40

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