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Ans. Please try below fixes.
1. Reboot your Device
Surprised with this workaround right at the top of our list in fixing Android notifications? Well, you shouldn’t be. This is because a simple restart may be the perfect solution to such type of problems. Just long-press your Power button once and tap on Reboot. Wait till the device reboots, and if the issue still persists, try out the other methods mentioned below.
2. Check your Notifications Settings
If restarting didn’t work out for you, make sure all the required notification access and permissions are enabled for the said apps. You may check for the same by heading over to Settings > Apps and notifications > Birthday & Wishes. Now tap on Notifications and see that all the necessary notifications are enabled for this app
3. Fix Android Notifications by Turning off Adaptive Battery
navigate to Settings > Apps and notifications > Birthday & Wishes> Advanced > Battery optimization.. Moreover, also check that the app is not restricted to run in the background. Disable the same from Background restriction feature
4. Fix Android Notifications by disabling the Do Not Disturb
Another important thing to consider while fixing up the Android notifications is regarding the Do Not Disturb mode. As evident from its name, the Do Not Disturb features silence all the notifications from all the apps, unless you whitelist them. So it may be that you have enabled it by mistake- more so after it has made up all the way to the notifications panel. So, to review its settings, go to Settings and look for Do Not Disturb mode under Sounds/Notifications. You may also use the search bar at the top of the Settings page for the same. From there, make sure you turn off this mode for the app of your choice, or entirely if you did it by mistake