Sorry for my late response. Thank you for all of your patience while waiting for a reply. I just wanted to make sure that your issue is addressed. I can definitely understand how frustrating your situation must be. I would love to help you find a solution to this issue.
Do you still need help with this issue?
Which cameras are you trying to add to the Nest App?
What troubleshooting steps have you done thus far?
Please let me know if you need further assistance.