InvalidClientException for the create_token_with_iam API

[koiker]

Describe the bug

When trying to use the API CreateTokenWithIAM with Boto3, I get an InvalidClientException error.
Looks like this method wasn't implemented or is implemented incorrectly.

Expected Behavior

Receive a response from the method as per documentation:

{
    'accessToken': 'string',
    'tokenType': 'string',
    'expiresIn': 123,
    'refreshToken': 'string',
    'idToken': 'string',
    'issuedTokenType': 'string',
    'scope': [
        'string',
    ]
}

Current Behavior

Exception:
An error occurred (InvalidClientException) when calling the CreateTokenWithIAM operation:

Reproduction Steps

Sample code snippet to test:

import boto3

if __name__ == '__main__':
    client = boto3.client('sso-oidc')
    try:
        resp = client.create_token_with_iam(
            clientId='arn:aws:sso::111111111111:application/ssoins-1111111111111111/apl-abc123def456',
            grantType='urn:ietf:params:oauth:grant-type:jwt-bearer',
            assertion='ey...WhA',
        )
        print(resp)
    except Exception as e:
        print(e)

Possible Solution

Need to troubleshoot to understand why it is not working.

Additional Information/Context

No response

SDK version used

1.34.89

Environment details (OS name and version, etc.)

Python 3.11 (Tested with OSX and AWS Lambda)

[koiker]

After some troubleshooting, the issue is not in the SDK.

[github-actions]

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