CS50 Codespace - 404 page when trying to access most recent files

[Meanderling]

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I'm trying to locate some files that are missing from my CS50 Codespace. I used to be able to access all of my working files and submissions via URL, but now that same URL only gives me a Github 404 page and I have no idea why??

I've looked into possible reasons and various discussion threads, but nothing seems to fit and no solutions (ie recreating the Codespace, logging out/in, viewing in a different browser, clearing cache, etc) have helped. I thought it might have something to do with the CS50 Codespace issue back in Feb, but my account Overview shows contributions throughout Feb, right up to March 6th, but then nothing at all until May 20th. However, I submitted the 3 tasks in 'Problem Set 8' on the 17th, 19th and 20th May (all visible via submit.cs50.io), so there should have been activity during that period.

Does anyone have any idea what might have happened to the missing files or how to get them back? I did submit this as a question previously, but was trying to keep my question concise and didn't mention the 404 and didn't receive any replies. However, it might have information useful in diagnosing the issue, as any help would be gratefully received...coz I'm well and truly stuck :(