IFrame access mobile, you can't create a new conversation

I installed a Jitsi server on a debianen VPS following the instructions. I can access a video directly from my computer and from my phone if I use my wifi. But if I switch to 4G, when I try to connect to Jitsi from my phone, I get a “you can’t create a new conversation” error.
I am using Jitsi in an Iframe.
Can you help me? thank you

Check your firewall, make sure required ports are open and properly forwarded. Check port 10000/UDP particularly - make sure it’s open in your network and properly forwarded, if you’re behind a NAT (seems likely you are).

thank you,
I found
In fact, the problem came from the config of the domain name with the IPV6
Thank you