Hello  @CKAJCA 

Tapo APP allows to login admin account on multiple phones,if a second mobile device needs the full permissions of camera, like Talk/ Vioce Call /Home or Away mode etc, you could try to log in admin account using same email address and password on that second device. Hope this helps!

Here is an FAQ explaining shared account permissions:

How to share your Tapo smart devices (smart plug, smart camera, smart lighting) with your families

Device Sharing permission for tapo camera is one pf the Popular Feature Requests for Tapo, you could go to corresponding thread, vote and comment for this feature.