Hi Samarth,
Thanks for getting in touch with us.
We do not see the issue on SDTT:
https://search.google.com/structured-data/testing-tool/u/0/#url=https%3A%2F%2Fxservicecenter.in%2F
Where are you seeing this issue?
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
Hello,
I have updated the sensitive data as requested. Can you please check further?
Thank you.
Hello,
Thank you for contacting Rank Math today.
It is likely that this is related to some sort of caching problem. I’ve tested the page but no errors are reported for me as well. Here is a screenshot:

Please purge your site cache and test again.
Looking forward to helping you. Thank you.
Hi Samarth,
This is not an issue we can fix.
You have to allow Google sometime to access your content and decide if it is suitable for the FAQ Schema.
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.