webhook add error 404 "Not Found"

[fcaputomobeats]

Bug report

Current behavior

/gitlab subscriptions add Group returns

Successfully subscribed to Group.
A Webhook is needed, run /gitlab webhook add Group to create one now.
Note: We are unable to determine the webhook status for this project. Please contact your project administrator

however, running /gitlab webhook add Group I get POST https://SELF-HOSTED-URL.example.com/api/v4/groups/241/hooks: 404 {error: 404 Not Found}

Expected behavior

/gitlab webhook add Group completing succesfully

Environment

• Self-hosted Gitlab Instance v18.1.1 ce
• Self-hosted Mattermost Instance v10.9.1 E1
• GitLab Plugin v1.10.0

Steps to reproduce

• follow the setup instructions
• Verified my user is included in the group
• Enabled Private repositories in the Plugin Configuration, Child Pipeline configurations and Code Previews for public and private repos
• perform on a private mattermost channel

1. /gitlab webhook add Group
2. /gitlab subscriptions add Group

Additional info

It seems I also cannot add just my repo to the subscription.

I've tried with:

/gitlab subscriptions add Group/Group Example
/gitlab subscriptions add group/group-example

The project Repo is named like "Group Example", and it looks like group/group-example in the URL