Here is the instruction "How to view Nest cameras via MyIPCam":
1. Set your Nest camera as a Public camera (don't share it for other people)
2. Open your camera page https://video.nest.com/live/[camera_public_id]
3. Click the right mouse button at this page and select "Inspect".
4. In the appeared code find string:
<div class="vjs-poster" tabindex="-1" style="background-image: url("https://[nest_sub_server].camera.home.nest.com/get_image?uuid=[uuid]&width=540&public=[camera_public_id]&);">
5. Copy string:
[nest_sub_server].camera.home.nest.com/get_image?uuid=[uuid]&width=540&public=[camera_public_id]
6. Paste this string to the MyIPCam Options (IP cameras tab):
See image below:
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