@jamesvandyne thank you for taking the time to answer. Regarding the URL for replies not working, it's actually happening with all URLs and Bookmarks are not working either.
@kandr3s micro.blog doesn't seem to be sending me webmentions for comments othre than my own. Odd – are there any error messages appearing when in your runserver in docker? Or if you open the dev tools in your browser, open the Network tab, then try to make a bookmark, you should see a failed request / 500 error?
@jamesvandyne It was actually the same issue reported here and the fix was as simple as you suggested. Thanks!