Mobile App Android the absence of push notifications

Mobile App Android the absence of push notifications

webapp - 10.0 build  10010 and 10011 too.
mobapp - 4.8

Hello! Not completely understood why and when push notifications was stop to working. We just having notification in Bell Button at the right top of the App.

I thought it was about connected Let's Encrypt ssl cert, but it was disabled and nothing was happened.

Configuration of the Notification Rules is attached, and it hadn't changed never.

at serverout log:
[SYSERR]|[INFO]|[2546]: at com.manageengine.servicedesk.notification.plugin.MobilePushNotification.pushNotificationToAndroid(MobilePushNotification.java:284)|

How could I resolve problem?

Thank Yoy for Your feedback asap!

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