Hello and welcome to Apple Support Communities, sashakil!
I understand you're not able to use Continuity Camera between your iPhone and Mac. I'd be happy to provide information to help you troubleshoot this issue.
Make sure both your iPhone and Mac meet these requirements: Use Continuity Camera on your Mac
"Check requirements
Continuity Camera works when your devices are near each other and set up as follows:
- Your Mac and iOS device have both Wi-Fi and Bluetooth turned on.
- Your Mac and iOS device are signed in to iCloud with the same Apple ID that is using two-factor authentication.
- Your Mac is using macOS Mojave and your iOS device is using iOS 12.
You can use Continuity Camera on your Mac in these apps:
- Finder
- Keynote 8.2
- Mail
- Messages
- Notes
- Numbers 5.2
- Pages 7.2
- TextEdit"
If you meet these requirements, please reply with any error messages you see when trying to use Continuity Camera, or any other details you can provide.
Thank you for using Apple Support Communities.
Enjoy your day!