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Hi Frank, thanks for your question.
The cartridges that work in the HP Colour LaserJet M277dw in the UK are the CF400A (Black), CF401A (Cyan), CF402A (Yellow) and CF403A (Magenta).
Based on the product codes you mentioned, the CF212A would indeed be the code for a yellow cartridge however, they only go in the M276N printer and not the M277dw printer (in the UK). If you could just double-check what your printer model is, and let me know if you purchased your printer in the UK or another country, I can give you a bit more guidance (it's possible your printer is not from the UK and takes a different product code to the ones we have listed due to regional encoding).