I had an intermittent printer issue recently. As a Mac user I have to submit jobs to the University printers via a web portal. I try to print very little so it’

I had an intermittent printer issue recently. As a Mac user I have to submit jobs to the University printers via a web portal. I try to print very little so it’s not something I use a lot, however I end up printing large numbers of midterm scripts every semester. On occasion I would log into the portal, upload my file and select the printer and it would tell me the file was printed. However when I went to the printer there were no jobs to be seen. IT insisted that my files were somehow corrupt but eventually they sent someone over to see my issue and they too were stumped. Finally they logged the server side activity of my printer interaction and they noticed that there was a space appended to my username, presumably by iCloud Keychain and the behaviour was possibly changing between OS updates. The web portal would let me log in, the server managed the files but the printer would ignore the job all because of that space.