Hey!
At first: Thank you for all your answers!
It′s working now.
Paul Barthmaier:
Thank you for your help. I just skipped the step writing here. I actually made it. That was not the problem.
Schuurmudgeon:
Thank you.
I originally set it up with subdirectories, yes.
Bet Hannon:
Thanks!
Now the solution:
When I created the Wildcard *.maf-world.com, I linked to: /maf-world.com/ instead of /www.maf-world.com/.
I don′t know why this is a problem, but now everything works perfectly.
In my case: You can switch between subdirectories and subdomains – even after a month.
Thank you all for your help! I set it to resolved now. :))