Can't find Airpods via Bluetooth?

Since the day before yesterday I have had the problem that my Huawei can no longer find my Airpods via Bluetooth, otherwise it always worked, I also checked how to reset them, but that doesn't work either. Do you have an idea why it doesn't work or did you have the same problem?

Your AirPods may not be charged. Otherwise I don't know what to do next.