Network share not possible with Nvidia Shield media player and PC running Windows 11 ?

Hey guys. I just replaced my desktop to a new Alienware with Core i9-10900K @ 3.70GHz, 32go ram and RTX 3090 graphics. I'm currently running Windows 11. My Shield media player is hardwired to my home network, same for my PC.

For the life of me, I can't get my shield to see my shared folders and hard drives on the PC... It worked great with my previous PC running Win8. I've done all the tweaks and mods I could find online that should resolve this issue but it still doesn't work. I've enabled SMB1, set all parameter for network share properly, deactivated password protected sharing, did all sorts of teaks in system manager etc... to no avail. When I activated Windows Media Player sharing, I got to see files trought UPNP which I don't use, but still no hard drive visible...

Is there something stupid I'm missing here? My Shield sees my computrer, it's just the shared files that seems to be denied access...

Any help is welcomed! Thanks

I'm not familiar with the Shield per se, but on your computer have you tried making an incoming advanced firewall rule allowing the ip address of your Shield? How to Add IP Address in Windows Firewall - Interserver Tips