Hi, I tried the code with new MS Edge chromium v80.0.361.33 beta 64-bit. I am getting BadRequest error However, it works well with chrome Version 77.0.3865.90 (Official Build) (64-bit) Please add support for new MS Edge chromium Also, the below sample works correctly on both the browsers mentioned above: https://gauntface.github.io/simple-push-demo/