Fixed for me as well
This was happening to me too. Try going into the insurance tab and then tap new device. click your device and just back out. It should go away after that.
This obnoxious and intrusive 1 orange notification is driving me insane. I will remove the Revolut icon from phone altogether now !
Android I’m guessing. I have Android 9 and maybe in other versions the path to the app is different but the “Force Stop” is the key. Settings, Apps& Notification and find Revolut or direct search in Settings for Revolut, open, Force stop. This will clear all the bubbles only if indeed you have read all the Notifications. Cheers.