HTTP2 SSL error in Nginx Proxy Manager

[Pierrala68]

Hello,
I installed Nginx Proxy Manager a few days ago and since then I've been having an SSL issue.
I was able to add my domain (from OVH) with DNS challenge, but when I try to connect via HTTPS I get the error "ERR_HTTP2_PROTOCOL_ERROR."

I reinstalled the entire server, and the same error...
By searching the letsencrypt folders, I found the certificate with its four files.

Can someone help me?