Scan to SMB 6515, error 018-763

Hi I have a very weird and frustrating problem.

I can scan to a share on my windows network by going manually through the following on the device:

Scan To  >  Network > SERVER-NAME > Share Name

Including entering username and passwords etc

This works so i understand that the printer and server can talk no problem with firewalls

I set up a contact with the exact same path, username and password

Every time i scan to the contact get the 018-673 error even though in the Recipient information i can see that the path is correct.

I changed the port to 445 in accordance with a post i found here