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I have gone through your Post and would like to help
Let's start with a Printer Reset
(1) Turn the printer on, if it is not already on.
(2) Wait until the printer is idle and silent before you continue.
(3) With the printer turned on, disconnect the power cord from the rear of the printer.
(4) Unplug the power cord from the wall outlet.
(5) Wait at least 60 seconds.
(6) Plug the power cord back into the wall outlet.
NOTE: HP recommends connecting the printer power cord directly to the wall outlet.
(7) Reconnect the power cord to the rear of the printer.
(8) Turn on the printer, if it does not automatically turn on.
The printer might go through a warm-up period. The printer lights might flash, and the carriage might move.
Wait until the warm-up period finishes and your printer is idle and silent before you proceed
On the Printer Keypad you will see Numbers at the Bottom right. You need to click on it and then you will get the options to enter Numbers and special characters
Please refer to the pictures below.
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Keep me posted how it goes
Thank you and have a wonderful weekend 😊
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