Home Sharing not working after macOS Tahoe upgrade

ok, been in talks with Apple for several weeks!

Scenario, Updated almost everything to 26, Mac, phones, iPad, ATV 4K, I have a Mac mini that I left on Sequoia which does the serving and the files sit on an external.

Phone ok, iPad ok, ATV all fine, can play imported files fine, but then came the annoyance, my Mac M1 could not play files, purchased was fine. My sons Mac which wasn't updated and running Sequoia was fine playing them too!

So was just my Mac running Tahoe, can see the files in the TV app, but no response when trying to play, tried another user on the same machine, same!! GRRRR

So Apple recommended I do what I was thinking of doing [which I had put off in case Tahoe was dodgy!] and that was update the Mac min server to Tahoe, did that and absolutely no different!

Ive had several calls with senior agents and still no joy, they've had me stripping apps of that may be interfering etc, VPN [profiles too] BitTorrent apps, any apps that may interfere with network stuff...

They've taken capture data and logs to see whats been going on when ive reproduced the sequence of trying to play a file. Nearly a month later and I am still waiting!

Ive seen that someone suggested it could be that the files are on external, but ive tested that and still no good. Today I tried an obvious thing and put a file on my Mac to see if the file plays on the Mac mini server...

Absolutely the same non result, nothing, does exactly the same, no response! So at least I know its not the machine I noticed it on, I cant be unlucky that its something on both machines! it has to be a Tahoe problem for sure!!!

One extra note, I had several playlists, if I access a file via those, the video actually opens a window but thats it, no playhead movement, nothing, can move the playhead but still nothing, just a black window!