I just setup new PCs (last week), and all of them show the correct favicon in the tabs of Chrome.
I alas don't know how to get the link to the favicon....
Anyway, good luck!
Edit: started Edge to see if that works too. So far only used to download Chrome...
Had even to visit google and duckduckgo first to be able to switch the preferred search engine. (Bing gives usually rubbish results for Europeans, even DuckDuckGo is better.)
And indeed, Edge shows the Y! icon.
Hmm, this forum version has no files upload...
Here they are, how I get them shown:
Chrome:
(on forum page: "Well of Souls forum", but same icon shows for homepage)
Edge:
(on home page: "Arioch's Well of Souls")
(images might get deleted after a month or so. Not a permanent file hoster anyway, but for this sufficient)
Sounds like all is correctly set, and that it's just once again the result of non-W3C compliance of MS browsers.
I did a quick search for this, and found entries in the range from last week, and 2013. All of them the same issue, that Internet Explorer/Edge does not handle the favicons correctly, while Chrome, Firefox,.. do handle them correctly.