Cloud messaging not enable from firebase

when i click for enable the cloud messaging but it show error, i try many times, any one can guide me. when i setup this for my onesignalpush

error:

i read some blog & community answers but fixed it by my self

https://support.google.com/chrome/thread/278291735/there-was-an-error-while-loading-apis-library-googlecloudmessaging-googleapis-com-authuser-0-projec?hl=en

may be it solve but i dont know how to

https://firebase.google.com/support/faq/#gcm-fcm

https://firebase.google.com/docs/cloud-messaging/migrate-v1

You should really be asking this on Stack Overflow, which is the place to ask Firebase questions.

@TIMAI2 any other method like web etc to send notification?