iPhone SE with iOS 12.4.1 running Ring app 5.23.1 does not allow configuring 4-digit access code for guest accounts. The keyboard entry portion at the bottom of the screen covers the entry fields, and the rest of the screen does not scroll. I was able to create the guest accounts and configure the access codes from the website.
We appreciate this feedback, @DrWho! If there are any screen resolution or keyboard settings on the mobile device, these might help for this scenario. Try also, removing and reinstalling the Ring app on that mobile device to see if it improves this operation.
In the meantime, I’ll be sure to share this with the appropriate teams for further investigation. If possible, feel free to send over a screen shot of this and any further observations.