Network Share

I have been using Rune Audio successfully for over a year now, but would rather use Volumio
I now have a third Pi 3B+ that I want to set up on my network.
Install went fine up and running with USB stick music.
Its the network share that is causing me great pain.
I have a Buffalo NAS with two 8TB drives of music.
No problem with Rune but with volumio after it finds the share and directory I get a mount error
There are no restrictions on the share
any help would be greatly apprciated

can somebody please help
I would really like to use this interface