Call waiting notification

[ASHOK_KUMAR]

If iam in a call , second line notification not shown in missed call.
Updated everything.
Kindly help

[victor010]

Hi, kindly help us with the following information to find a solution to your query.
1.  Name of the Asus device you are using.
2.  Firmware version your device is on.
3. Elaborate more on your concern.

Hi, we'd request you follow the below steps:
1. Clear system cache.
2. Try the same under safe mode:
Hold the power button for 5 seconds => When the screen flashes with option => Press & hold power option => You will get an option to restart in safe mode
3. If still you face the issue factory reset your phone after taking a full backup.

[ASHOK_KUMAR]

Model and firm version screenshots uploaded.
Using android 9.
I will try the other options given you and update soon.

[ASHOK_KUMAR]

Issue - If iam talking with one person , the another person call is not notified in screen and not stored in missed call area.
Have done given option and except 3rd option.