Hi Kath,
You can indeed use the URL functionality of the pages. If you add the 2 entities as page parameters, they will become available for you to configure in the deeplink URL.
When configuring the deeplink you have 2 options:
So if you already have the UUID available now for both objects the first option is the best approach. Mendix will do the retrieve automatically for you and pass the retrieved objects into the page parameters.
For the SSO, you can pass a continuation URL to the login service as such: http://localhost:8080/SSO/login?cont=link/yourDeeplink