Running Matlab in a docker container

I am trying to run Matlab in a docker instance using the following repo: https://github.com/mathworks-ref-arch/matlab-dockerfile

I have followed the steps and built the image. To activate the license and run a job, tried the following

docker run --rm -it --entrypoint=/bin/bash -v /path/to/licenses:/licenses matlab:r2020b

where

# cat activation.ini
isSilent=true
activateCommand=activateOffline
licenseFile=/licenses/license.lic
installLicenseFileDir=/licenses/
installLicenseFileName=license.lic

# ls licenses
activation.ini license.lic

Inside the container I then run

matlab@b4d167dfc26b:~$ /usr/local/MATLAB/bin/activate_matlab.sh -propertiesFile /licenses/activation.ini
Silent activation succeeded.
matlab@b4d167dfc26b:~$ matlab -batch "4+4" 
matlab@b4d167dfc26b:~$ ---------------------------------------------------------------------------
Error: Activation cannot proceed. You may either:
1. Set an X11 display, and restart the activation process
2. Use the silent activation feature
3. Activate using the license center
---------------------------------------------------------------------------

I don't understand why the license activation doesn't work, when it seems to succed. I have made sure that the user for the licence.lic file is the correct one (matlab).

Any ideas?

[Parker Morse]

This looks like the same problem as "Activation still required after silent activation succeeded". Does Lizz Cooper's comment on this answer solve this problem?