Login form for external backend account

Hello. We have a site that will have a user login button that allows the user to login via a form to an account on a platform which is external to Webflow.

The plan is to use a standard Webflow form with the ‘Action’ field in form settings set to the address of the external account and the Method set to POST.

Can somebody please confirm that this approach should work? I’ve not had to do this from Webflow yet, are there any traps to watch out for?

Cheers
Grant