Why don't you try using a link button and just give it a '/ZeokenDossier’.
I have another problem with this flow though because if the page is asking for an Id, then that means that it needs a page parameter which you are not sending so the ‘/0’ you are adding might be problematic.
If that is the case, you will need to do a work around and retrieve the object with a microflow when the new tab page is opened. So that you do not have to pass the object Id in the URL (This is only if you do not know the object ID).
There could be another way around this but based on my understanding of what you have mentioned on here, this will be my first try.
I already found the solution. It was indeed the identifier 0. I added the id of an existing entity and it worked according to the configuration above!
The new micro flow would look like this:
This works fine as the page opens without any results given. I hope that this information will also be useful to other users!
With in the URL the following: