How can we access our Doorbell Pro from each of our phones???

Simpli put, there is no easy way that my partner can access our Doorbell on her phone (iPhone).

I purchased the Doorbell Pro system and got it set up (getting the doorbell to work/get powered up was an adventure of its own). I set it up and got the service up and running on my Android device. However, I want her to be able to use the app without using my login info so she may view the cameras.

Any help? Why does Simplisafe make it so hard to do something so simple? My Eufy surveillance system allows you to send an invite right from its own app, why can't Simplisafe do the same???