I'm pretty sure it won't work unless you disable SMBv2, which is a terrible idea.
Better to simply switch to FTP, just install that on the server and make the ftp root use the same folder as the SMB share, then the client PC's will stay mapped and the only thing changing will be how the printer gets the scan there.
But if you really want to attempt to make the printer work, you would have to get it to the latest firmware, which is still 3 years old and before the WannaCry updates on your server.
You will also want to change the format of the username, because it isn't just Administrator and you can confirm that by adding it to the share itself, the printer needs to be using it as it appears within the brackets here
And by all rights you should also add the specified user to the Security tab as well
And yes, port 445 is the correct one to use.
But I really don't think it is going to work, the SMB landscape has changed drastically and the older printer/scanners just don't work well or reliably unless they have firmware in the 2016 and up range. In the long run, and usually the short run too, FTP is simply going to be more usable.