When using the above url I cannot logon with PayPal sub accounts. This url can be called directly in the browser and if you try to use sub account instead of an email, you get the validation prompt that this email format does not look right.
The above url is in the following string
in the sample code provided.
I need users of my app to be able to logon using the sub accounts (additional users account) in PayPal instead of an email address.