@aitortomas - this might be due to how you initially connected the domain - not sure. I would contact HubSpot Support for this and tell them that you’re looking for the TXT & CNAME for updating your reverse proxy domain configuration. They may initially state that help with reverse proxy is not supported by HubSpot Support (which is true for a full setup, however getting CNAME & TXT records to validate is something they should be able to help with, though they may need to get back to you about it).