"Vůbec mne nepoznal."

Translation: He did not recognize me at all.

[BrianG1941]

Why is nepoznal translated as 'not recognised' and 'not known' is not accepted even though it is the only translation given in tips.

[VladaFu]

I will add recognize to the hints. Note that "poznat" can also mean "get to know/learn" even though the main meaning is "recognize".

To know is "vědět" or "znát".