Opening Progressive Web App AmpleNote to a Specific URL

I'm trying to use KM to open a PWA app called AmpleNote on a specific page, for example, "Amplenote - Login".

This opens up at the correct site (the calendar) in Chrome directly but only opens to the default page in AmpleNote when the "open URL" action is used in KM. I can use KM to "activate" AmpleNote just fine, albeit always opening at the default page.

Any ideas on why the desired behavior is not being observed?

Cheers, Gavin