Can I reset/delete my site’s registration on ap.ghost.org?

I set up a self-hosted Ghost on Docker following the installation guide (Ghost 6.0.6, Docker, Caddy).
I want to use the Ghost(Pro) hosted ActivityPub Service, but I can’t initialise ActivityPub due to the following error:

ERROR No webhook secret found - cannot initialise

The solutions found in forum posts and GitHub issues (such as editing snippets/ActivityPub) didn’t work for my case.
However, if I host the ActivityPub Service myself, or if I change the DOMAIN on .env (example.com to aptest.example.com), the initialization succeeds without any errors.
Because of this, I suspect the problem is not with my server configuration, but that something went wrong during the initial registration with ap.ghost.org, and corrupted data may have been stored.

Is there any way to reset or delete my site registered on ap.ghost.org?
If not, would it be possible to ask the Ghost team to reset or delete it manually?

Apologies if my English sounds awkward — I used machine translation and ChatGPT to write this.

Looking at similar cases, this issue may not be caused by corrupted data, but instead by a change in the secret key or something similar as a result of reinstalling Ghost.
Either way, it seems that deleting or resetting the site data is still required.

In the end, I decided to use a self-hosted ActivityPub Service, so I’m marking that as the solution for this post. As I mentioned earlier, there’s another thread about the same error, so please use that one going forward.

I wonder if it is finally possible to host and use Activitypub Ghost integration with an owned/self-hosted AP instead ap.ghost.org?

You’ve been able to from day one. Ghost’s implementation of ActivityPub is fully open source, and ap.ghost.org is an option (with limits) for users that don’t want to go through the hassle of hosting yet-another-service.

Thanks for your reply, I tried twice but I can’t use my own AP. I found some guide that suggested this:

To make this work, we’ll set up a small Nginx rule that forwards those special routes, like /.well-known/webfinger and /activitypub/* to https://ap.ghost.org.

And that is what I am deliberately trying to not do because I want to self-host all my Activitypub instance.

Tried so many Nginx block templates and I really appreciate a clear guideline into this :)