Airtel Volte not enabling in Asus Max M1 pro

[Max_M1_pro]

Please tell us some basic information before asking for help:
Model Name:  Asus Max M1 pro
Firmware Version:.087
Rooted or not: not
Frequency of Occurrence: Always
APP Name & APP Version (If your issue relates to the app):
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.
========================================
Airtel Volte enable option is not showing in my mobile for Airtel SIM. Same SIM is working fine in Volte with another handset like MI & Realme. Please help to resolve my issue.

[Max_M1_pro]

I hv done sim swap but still enable Volte option is not visible, Pls support.

[Max_M1_pro]

Pls help to resolve my issue. Option for Volte enable is not showing.

[fussion_ASUS]

Hi, we request you to kindly post it in the respective phone section.