Thanks, I will check it out. I thought I had found the answer (I found "URL Builder" in the docs) but it still won't look up the routes inside Edge. And one clarification: I'm not doing subdomains, I'm doing different domains. It works fine on the routing end - everything routes correctly - but it's just inside Edge that it won't work. I will look at what you did and can probably kitbash it to my usage. I really appreciate all your time. You're a mensch.

Just FYI, this is how I generate the routes in my routes.ts file:

for (let site in Sites) {
 router
  .group(() => {
    router.get('/welcome/:tab?', [WelcomeController, 'welcome']).as('welcome')
    router.get('/join', [JoinController, 'join']).as('join')
    router.get('/upgrade', [JoinController, 'upgrade']).as('upgrade')
    router.resource('users', UsersController).as('users')
  })
  .domain(Sites[site].domain)
  .as(site)
}