Keith I have just tried it via web and it works without any problem.
You go to "recordings" then to "archive" and there you can directly delete the archived recording by clicking on recycle bin.
Or you click on the title and then on the recycle bin (actually it is a shame to delete Ornella Muti 🤣)
Then you will be asked if you want to delete the recording
If this doesn't work, you can delete the cookies of the browser and the browser history (sometimes such things help, don't ask me why) or you try another browser.