Even without the symlink you have to get the device mapped to the container somehow. What were you doing before? The only other way I can think of is priviledged mode. I don’t like priviledged mode for docker containers but basically it takes whatever was on the host USB wise and puts it in the docker container as is. If you are using priviledged mode you would have to specify ttyACM10 on the Home Assistant side in the ZHA integration as well.
We had a discussion recently about priviledged mode here
You may want to post your entire docker run command to double check its setting up the container properly.
I recall having to reboot my machine. Just trying to reload the udev rules didn’t work for me, and I thought I did something wrong, but it worked on reboot.
If the symlink worked running ‘ls /dev/ttyACM10’ should work without an error.