Comment 2 for bug 1926989

Correction to original post

sudo lpoptions -p Letters/test -o InputSlot=Tray5

is creating an lpoptions file, but the Letters/Test instance is not showing up in libreOffice or other printer lists.

If I do a su - and then do the lpoptions command, no lpoptions file is created.

If I use lpoptions as a non root user it creats the ~/.cups/lpoptions file, but still the printer instance in the file is not showing up anywhere to be printed too

In summary, the real problem is not with the lpoptions command, but with the lpoption files being ignored.