The computer is already connected via SMB (file and printer sharing) to another computer and a new connection is being attempted with a different user name.
The most common cause is having a mapped drive connected to a share on the target computer with a different user name than that used by PDQ Deploy or PDQ Inventory.
Disconnect all previous connections to the target computer and try again.
The target computer may not be processing the domain name in the credentials as expected. If your credentials are using the fully qualified domain name (FQDN) for the domain then try creating a new set of credentials using the same account but the short name of the domain. (e.g. Instead of intra.raindog.com try raindog). Reverse this if you are already using the short name.