Are you in a special context or did you perform some particular tweaking on your YunoHost instance ?** : no
I’ve successfully installed an instance of Funkwhale but unfortunately I’m not able to connect due to an insecure connection. All my other apps have no issue with the certificate
Wow, I feel stupid. I assumed that it was only necessary to have a certificate for the root domain. It didn’t occur to me that I would need to generate for each subdomain, which seems obvious now that you point it out.