Google map api shows request in console but gives me 400 for bad key

Cesium ion
1

hi,
Trying to load photorealistic tiles but google map api but get below error. Console shows requests as all failed. Am i missing anything, sticking to CesiumJS: Photorealistic 3D Tiles from Google Maps Platform – Cesium. Key is fine for JavaScript api

“code”: 400,
“message”: “API key not valid. Please pass a valid API key.”,

2