Verification fails but I see LE collecting the verification token from my server

Help
4

So that proofs your configuration is completely buggy.

--standalone starts an own webserver, so you can never see the static validation file.

And there

http://test.crea.nkcn-cia.be/.well-known/acme-challenge/MRwXHLne3dQYNnPeT-9l6kqmSxwd-DItfEHQx8R2DCA

runs now a webserver, so why do you use standalone?

Please start there:

https://certbot.eff.org/docs/using.html