The problem does not lie in the redirection process, but in the application association. The 404 page is normal because a 404 page does not open a page, but initiates an application association. Due to compatibility reasons, the Android system cannot associate with Google Home or Assistant. Just refresh the page or switch the default browser to Chrome.
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This does resolve it for me, was using Android with duckduckgo browser and was getting the 404 error, switched the default browser to Chrome, and it worked at first attempt.
Thanks It works for me two.
I tried the same for a deezer connection from google home which was broken two, and it works equally.
It seems that google is on war with Firefox. 