Model Loading in Azure Databricks Failing even after Service Principal Authentication

I am trying to run a DatabricksStep. I have used ServicePrincipalAuthentication to authenticate the run:

appId = dbutils.secrets.get(<secret-scope-name>, <client-id>)
tenant = dbutils.secrets.get(<secret-scope-name>, <directory-id>)
clientSecret = dbutils.secrets.get(<secret-scope-name>, <client-secret>)
subscription_id = dbutils.secrets.get(<secret-scope-name>, <subscription-id>)
resource_group = <aml-rgp-name>
workspace_name = <aml-ws-name>

svc_pr = ServicePrincipalAuthentication(
       tenant_id=tenant,
       service_principal_id=appId,
       service_principal_password=clientSecret)

ws = Workspace(
       subscription_id=subscription_id,
       resource_group=resource_group,
       workspace_name=workspace_name,
       auth=svc_pr
       )

The authentication is successful since running the following block of code gives the desired output:

subscription_id = ws.subscription_id
resource_group = ws.resource_group
workspace_name = ws.name
workspace_region = ws.location
print(subscription_id, resource_group, workspace_name, workspace_region, sep='\n')

However, the following block of codes gives an error:

model_name=<registered-model-name>
model_path = Model.get_model_path(model_name=model_name, _workspace=ws)
loaded_model = joblib.load(model_path)
print('model loaded!')

This is giving an error:

UserErrorException:
	Message: 
Operation returned an invalid status code 'Forbidden'. The possible reason could be:
1. You are not authorized to access this resource, or directory listing denied.
2. you may not login your azure service, or use other subscription, you can check your
default account by running azure cli commend:
'az account list -o table'.
3. You have multiple objects/login session opened, please close all session and try again.
                
	InnerException None
	ErrorResponse 
{
    "error": {
        "message": "\nOperation returned an invalid status code 'Forbidden'. The possible reason could be:\n1. You are not authorized to access this resource, or directory listing denied.\n2. you may not login your azure service, or use other subscription, you can check your\ndefault account by running azure cli commend:\n'az account list -o table'.\n3. You have multiple objects/login session opened, please close all session and try again.\n                ",
        "code": "UserError"
    }
}

Why is there a Forbidden Error when Authentication was successful?