ErroRequests to the server have been blocked by an extension

I am configuring onlyoffice to nextcloud, I can connect the nextcloud to onlyoffice, but I have the error “Requests to the server have been blocked by an extension.” when opening the doc.
They are separate servers, one for onlyoffice and one for nextcloud. I have a proxy server on the edge, and there is the redirect https and ssl certificates.
Ubuntu servers 18.04, nextcloud with apache.
Follow my nextcloud config.php file …
ksnip_20200930-151039