I am not able to print a password protected PDF from either my iPhone or iPad to my Epson ET-3760 AirPrint-enabled printer. Tapping the share then print button brings up the alert to enter the password to unlock printing. I enter the correct password, tap "OK," select the Printer Options and then tap "Print." I then get a message stating "EPSON ET-3760 Series An error occurred printing this document." The printer does wake up and I see "Printing..." on the printer's control panel, but nothing gets printed. I have also tried printing the document after transferring it to the Acrobat app, but still get the same error message and nothing gets printed. I have contacted Epson and Apple Support without any resolution. If I transfer the PDF to my computer, I have no problem printing it from there to the same printer after entering the PDF's password.
I have a similar problem . I was able to print password protected file in my iPhone 6 earlier , but not in iPhone 11 , but by using only iprint ( not with print command) . After updating iOS version of iPhone 6 and printer , even that has gone . Any solution ?