For the first time I had posted something in the marketplace.
A search ad.
That was on 23.8.
Since this ad didn't show up in the marketplace, I thought I'd made a mistake.

Since I needed the part very urgently, I (forbidden way) switched a search directly in the forum.
I got help immediately.(Thank you Rainer)

Yesterday on 2.9 I got an e-mail that unlocked the ad.

Sorry, but 10 days to unlock is effective too long.
If you need a spare part on which the usability of the vehicle depends, this market place is completely unsuitable.
To avoid posting search ads in the normal forum, the activation of search ads should take place immediately. (in my opinion)