Is the domain name set in the Bizhub? It's possible the old router didn't care if the Bizhub had the right domain or not, it routed the SMB request correctly. Maybe the new router is more picky about a correct domain name?
Sorry if you've tried this already but have you powered off/on the Bizhub yet? The Bizhub might have the old router path cached and a main power switch reboot is the only way to clear it out.
Sometimes using the ping command from the copier control panel can force it to refresh the cached route. Utilities> Admin settings> Network Settings> Detail settings> Ping confirmation
See if the copier can ping the hostname of the shared folder.
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