How to get guest powerapp to work in the powerapps mobile app.
This is for those who have shared apps externally with users and want those apps to show up on the users mobile device.
Here is a semi somewhat work around that you can try.
Tested on an android device
1.) Share the app as per normal process for a external user and make sure when you share it, that it will also send them a email notification.
2.) Make sure powerapps is installed on their mobile device.
3.) Advise the external user to open the email from the mobile device and select "open app". It should prompted them to either open via the browser or powerapp, Choose "Powerapps" of course.
4.) Sign in as per normal and there you go, it'll open in the powerapps mobile app.
5.) Swipe to the right to close, refresh your app list and you'll see the guest app in the list but all the other apps will disappear if there were other apps. Dont worry that's the "Odd" bit. Lets continue..
6.) On the gust app select the 3 dots or ellipses (not sure what its called) and pin the app to the home screen.
To get back all the other apps that there might of been, close the powerapps mobile app and reopen it (not using the guest app icon on the home screen).