I was receiving very similar error messages on debian sid.
I found the issue was that /etc/cups/cupsd.conf went through a significant change at some stage in the last ~3 months and requires a refresh.
Try replacing your /etc/cups/cupsd.conf with the one attached (default package version), reinstall your printers and see if it resolves your issue
I was receiving very similar error messages on debian sid. cupsd.conf went through a significant change at some stage in the last ~3 months and requires a refresh.
I found the issue was that /etc/cups/
Try replacing your /etc/cups/ cupsd.conf with the one attached (default package version), reinstall your printers and see if it resolves your issue