hi sir, I installed the Litespeed chache plugin and when I tried to apply for domain key it is showing the following error:

#1
notice:
Failed to communicate with QUIC.cloud server: The callback validation to your domain failed. Please make sure there is no firewall blocking our servers. Response code: 403


There was a problem with retrieving your Domain Key. Please click the Waiting for Approval button to retry.
There are two reasons why we might not be able to communicate with your domain::
1) The POST callback to https://swarajgraphics.in/wp-json/litespeed/v1/token failed.
2) Our Current Online Server IPs was not whitelisted.
Please verify that your other plugins are not blocking REST API calls, whitelist our server IPs, or contact your server admin for assistance.:

How can I get rid of the this error?
 
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