Collabora cannot access my office through domain name

For first post, please answer the questions below!

Describe your issue in detail

Collabora can be enabled when I access my cells through ip+port, but cannot be enabled when I access through the domain name cab.cantian.tech
This is my docker startup command:docker run -t -d -p 9988:9980 -e “username=admin” -e “password=123456” -e “domain=cab\.cantian\.tech” --add-host=cab.cantian.tech:192.168.2.235 --name=cab8 --privileged=true --cap-add MKNOD collabora/code

What version of Cells are you using?

4.4.7

What is the server OS? Database name/version? Browser name or mobile device description (if issue appears client-side)?

centos 7.9
mysql 8.0
chrome

What steps have you taken to resolve this issue already?

I have modified my domain name and the reverse proxy configuration of nginx, but it has not worked.