Now, my sendbird chat notification is not receive with android

[Problem/Question]
The FCM token was registered properly, but no Android notification was received.
It is sent normally in the FCM console, but when using sendbird’s notification test, ’
Couldn’t send push notification.’
Something went wrong. ‘Please try again.’ is displayed.
I also entered the server key using the specified method, what is the problem?

Currently it says sent, but never actually arrives

Please refer to the article. I understand that data is not received in the background.
messaging().setBackgroundMessageHandler

Currently, I know that this method does not work when there is only data and not notification, so I am wondering if it is possible to change the sending format to data → notification.

Hello @Yeonho_Jung ,

Could you please DM me the app-id and timestamp of the issue so that I can check the logs ?