Hi Michiel van der Velden,
Before checking with the support, perhaps do the following:
Have a look at what the Console tells. Eventually, there is a hint of what is going on.
Reduce the set up to one additional render only, to speed up the research.
Besides that: Take all plugins out and see if it starts then. If it starts, you need to check with the Developer of the plugin.
Which plugin causes the trouble (if so?)
If so, there are two ways to check which one causes the problem.
Take all plugins out and place them back in one by one, and check Team-Render each time. I would do this for four to five plugins.
If you have more, take half of the plugins out and check. If all is fine, place half of the plugins back in, and so on.
Besides that, are all plugins compatible with your current release of Cinema 4D?
Are all plugins on every machine in the Team render the same build/release.
Since there are a few hundred (if not more) plugins available, you might check with the developers of such.
If the Team-render doesn’t start, even all plugins are removed, please contact the support.
https://www.maxon.net/en/support-center
All troubleshooting suggestions are here:
https://help.maxon.net/us/#1101
Fingers crossed, things are up and running in no time.
Additional information:
https://www.cineversity.com/vidplaytut/cinema_4d_team_render_part_10
Cheers