Slack webhook creation issue

Hi, I’m hitting an issue when trying to create a Slack webhook – the https://slack.postmansmtp.com URL that the “Get your webhook URL here” link in the Settings page leads to goes to an “Index of /” server directory page, instead of the correct webhook setup page I used to see in the past when doing this. I’m using the latest plugin version, 2.5.5. Could you check it out please?

The page I need help with: [log in to see the link]