K Toner Not Installed - OKI C5500n Printer

Question edited for a lot more clarity.
Question moved to Kyocera.

Nothing to do with a fax card, just make sure the back door is closed. It is normally called the 'Bypass Door' and gives card stock a flat run.

Kyocera FS-2026MFP "Toner Cartridge Improperly Installed"

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May 26, 2020 - I have tried multiple things and the error message is still there. 1.) tried new toner cartridges. 2.) made sure toner waste basket was ...

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Did you get a Samsung toner cartridge or an off brand? Toner cartridges have small chips that tell the printer how much toner is left.. Not all of those chips will work correctly.

replace with correct Original manufacturer toner cartridge.

The counter reset method depends on the cause of the toner life end message and the condition of the newly installed cartridge.
When a USED toner is installed the reset gear is set to IN USE.
When a NEW toner is installed the reset gear is set to FACTORY SET.

Turn of the printer unplug and then turn back on.

Was the toner you installed a Kyocera toner or a after market toner? If it was an after market toner that could be your issue.

With the front cover open (where the cartridge is installed), press the clear/back button then press star 00 (*00), then close the cover.

Yes you must pull it out in order to use the toner cartridge. It is there to protect the toner dispenser component inside the cartridge. You can find how to install/replace toner cartridge printed on the Toner cartridge's carton box.

Reconditioned drums cause this error apparently.

remove plastic cover from toner yellow or any color and install toner properly.

Sounds like it may be a remanufactured toner cartridge, and the 'reset lever' has not been installed or replaced. If you look at the side of the toner unit, you will see a sort of 'half moon' notch, that should have a white coloured lever within it. This lever is pushed backward when the cartridge is installed. So, on a new cartridge, it should be pushed forward (or towards the printer as you install it).
Note: This lever is not installed on the cartridge that the printer was shipped with (starter cartridge).