Thank you @Marc for your quick reply! I had to changed it slightly.
Interestingly my holomap example is working for me in the notebook (except the hover text) but the panel solution is not working in my jupyter notebook. However when I save the panel as static html and open it in a webbrowser it is working…
I think it may be related to my version of bokeh (Cannot get the getting started example to update the figure - #6 by lhoupert). If you want to see by yourself, you can access the last version of this test notebook (choropleth_data_link_holomaps.ipynb (9.1 MB) or available here).
You can see that the holomaps object is working fine in the notebook while layout_pn is not. However, the static html file generated from the panel example is working fine in a web browser (see example here)
What version of bokeh are you using? (mine is the 2.2.3)