after update pie volte was not working

Please tell us some basic information before asking for help:
- Model Name: ASUS_X00LDB
- Firmware Version: PIE 9
- Rooted or not: not rooted
- Frequency of Occurrence:
- APP Name & APP Version (If your issue relates to the app): NETWORK ISSUE (VOLTE NOT WORKING )
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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Comments
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.