I thought I would just do (I hope, a helpful) update on here wrt this issue. I recently bought myself a nice new HP laptop with windows home on it and it couldn't see my Tower server. My resolution went like this:
1. Did the SMB 1.0 thing. No luck
2. Double checked all my network settings on Tower (DNS config etc.). No luck
3. Screwed with Dword settings in registry. No luck
4. Installed Group policy (https://www.itechtics.com/enable-gpedit-windows-10-home) - method 2 worked for me. Then changed GP settings. No luck.
5. Got really, really frtustrated.
6. Rebuilt laptop with Windows 10 Pro.
Immediately worked.
Time: 4.5 hours. Can I bill Bill?
I am more of a fan of Windows than I used to be but this sort of thing does my head in. I don't need a solution anymore but if anyone figures it out I suppose you could post it here. I think this is something that UNRAID should get solved because I suspect they will be losing customers at test stage. Unraid is great but you do have to be reasonably nerdy to use it still.
I should have mentioned that I wouldn't have gone ahead with UNRAID if it wasn't for SpaceInvaderOne - his videos are brilliant.