I also want to control one set of hardware from two phone apps. I tried to share. It sends an email to the other person’s phone saying to click the link to install blynk, which works ok, but then it says to activate the camera and point the camera to the code below. There is no code below in the message. And even if there was how do you point the phone camera to something on the same screen? I think I’m missing something here. Please help.
iOS, Android?
Versions of phone, Blynk Library, App, etc?
Are you using share or clone? They are different.
Depending on the other person, you may find it simpler to just have them use the same login, then they have full access to all projects.
Open the email on a PC and use the camera phone that way 
(assuming of course the QR code shows… get us the rest of the info and take it from there)
PS, I moved you into your own Topic.