Error retrieving Domain Key

Hi, I’m having trouble activating quic cloud via your plugin, I just get this error message:

Notice:
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://www.app.spikemetoden.se/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 have deactivated all plugins, but still the same. I have also had my internet provider add the ip’s to their whitelist.

What else can I do? Any idea to why this is not working?

All plugins, theme and WP is updated to latest version. PHPmemory limit is 1046 and php version is 8.0.

The page I need help with: [log in to see the link]