@sariette
Unfortunately, these are secrets that no one will tell you. I don't use xenforo anymore for this very problem. You have to make some mistakes in the code, but no one will tell you... because they are professional developers and they are jealous. Do you know what they will tell you? That it's Google's fault and that you have to wait, that your site is new and you have to wait, or you have to contact some professional developer who has to check both the xenforo code and the search console. Xenvn can never help you with this problem. I also tried to contact them, but they always tell me the same things. In the end, they move forward and we are behind hahaha. You have to pay someone who offers you service and availability, but it's difficult! Good luck bro!