Can't access CS:GO map via main menu

I asked this in the Question-Megathread before but it perished:

I’ve got a fully working, gimmicky CS:GO map (tested via “map [mapname]”, compiled with final settings), published it

but whenever I try to load the map via the workshop menu (match against bots) it loads a default map.

What could be the problem? There is a navmesh in case you’re wondering.
You can see I try to find a solution since November so help is much appreciated!

Did you take “Offline with Bots”, then changed Game Settings to Workshop and then choosed your map in the list, hit accept, choosed whatever mode you wanted to play and clicked go then go?

Yep, I did. Here’s a video of the problem: