Manufacturer Huawei installing its own EMUI shell on phones. It is stand out by very aggressive power-saving enabled by default, which does not allow apps to work normally in the background (while screen is turned off or locked). For correct work of Prof Reminder it’s required to disable Power-saving and enable Autostart, Work in Backgroud….
For correct work of application: 1) In “Settings ⟶ Battery” turn OFF “Power saving mode” and “Ultra power saving”. 2) In “Settings ⟶ Battery ⟶ App launch” turn OFF option “Manage automatically” then click on Prof Reminder and turn ON options “Autostart”, “Work in background” and “Indirect start”. 3) In “Settings ⟶ Apps…
For correct work of application: 1) In “Settings ⟶ Battery” turn OFF “Power saving” mode. 2) In “Settings ⟶ Battery ⟶ Launch” turn OFF option “Manage automatically” and turn ON options “Autostart”, “Work in background” and “Indirect start” for Prof Reminder. 3) In “Settings ⟶ Apps” turn ON option “Ignore battery optimization” for Prof Reminder.
For correct work of application: 1) In “Settings ⟶ Battery” turn OFF “Power saving” mode. 2) In “Settings ⟶ Advanced Settings ⟶ Battery manager ⟶ Protected apps” turn ON Prof Reminder.