problem with retrieving your Domain Key

Hi

I have the following message in the General Settings of my LiteSpeed Cache:

Notice:

There was a problem with retrieving your Domain Key. Please click the Waiting for Refresh button to retry.

There are two reasons why we might not be able to communicate with your domain::

1) The POST callback to https://casa-indigo.com/wp-json/litespeed/v1/token failed.

2) Our Current Online Server IPs was not allowlisted.

Please verify that your other plugins are not blocking REST API calls, allowlist our server IPs, or contact your server admin for assistance.:

I tried several times the “Waiting for Refresh” button. My Dashboard on QUIC.cloud does not show any error.

I allowlisted your IP’s (currently 141) in my Cloudflare Dashboard.

The other topic (1) is completely DARK for me, can you explain un simpler words what I am supposed to do?

Thanks