We have determined the root cause and we are awaiting feedback from an external third party. As stated within our public documentation, whitelisting dcbstatic.com in your DNS filtering or web security tool will restore access immediately. For the full list of Docebo domains that should be allowed on your network, please refer to our network access configuration guide.
https://help.docebo.com/hc/en-us/articles/26343028600210-Configuring-network-access-for-Docebo