After installing jupyterlab-link-share new Share menu not available

I could use someone’s help on how the get my jupyterlab-link-share extension working.
I have an installation of JupyterHub running with Jupyterlab.
I installed the link share extension with this command: conda install -c conda-forge jupyterlab-link-share

Checking with jupyter lab extension list, everything looks okay

Config dir: /opt/conda/etc/jupyter
jupyterlab enabled
- Validating jupyterlab…
jupyterlab 3.4.6 OK
jupyterlab_link_share enabled
- Validating jupyterlab_link_share…
jupyterlab_link_share 0.2.4 OK
nbclassic enabled
- Validating nbclassic…
nbclassic OK

Config dir: /usr/local/etc/jupyter

However, after restarting the JupyterHub service, the Share menu item does not appear in the Jupyterlab UI.
Here is a list of the relevant versions of Jupyter stuff I have installed:

jupyter 1.0.0 py38_7
jupyter-packaging 0.7.12 pyhd3eb1b0_0
jupyter_client 6.1.12 pyhd3eb1b0_0
jupyter_console 6.4.0 pyhd3eb1b0_0
jupyter_core 4.7.1 py38h06a4308_0
jupyter_server 1.16.0 pyhd8ed1ab_0 conda-forge
jupyter_telemetry 0.1.0 pyhd8ed1ab_1 conda-forge
jupyterhub 3.0.0 pyhd8ed1ab_0 conda-forge
jupyterhub-base 3.0.0 pyhd8ed1ab_0 conda-forge
jupyterlab 3.4.6 pyhd8ed1ab_0 conda-forge
jupyterlab-link-share 0.2.4 pyhd8ed1ab_0 conda-forge
jupyterlab_pygments 0.1.2 py_0
jupyterlab_server 2.10.3 pyhd8ed1ab_0 conda-forge
jupyterlab_widgets 1.0.0 pyhd3eb1b0_1

Any pointers would be greatly appreciated. Thanks!

Anything glaring in the browser console/network requests?

Also, the first block looks like the output of jupyter server extension list, not jupyter labextension list.