Battery optimization setting for notification - Huawei P20.

Please try the following steps:

1) Go to Settings → Advanced settings → Battery manager → Protected apps, then find skooly, and protect it.

2) Go to Settings → Apps → advanced → Ignore battery optimizations, then find skooly and ignore it.

3) Go to Settings → Notification panel & status bar → Notification centre, then find skooly, then activate “allow notifications” and also “priority display”

4) Go to Settings → Apps → special access → unlimited data access → choose skooly and allow it

5) Restart your phone.