Is this some type of competition to see who can know the least about biology? Because you're definitely acting like it's a competition to know the least about biology. I think the walrus is still edging you out slightly. Maybe up your game a bit.

We do have a unique gender for everyone, we just don't have words for each specific position on the spectrum because it's so variable. That's why we have umbrella terms like nonbinary or gender fluid.

Sex is binary. It is "enshrined in biology". There are exactly two sexes. Female (x only) and male (x and y). The doctor classifies your phenotypic sex (what genitalia you have) at birth because it's the same as your genotypic sex (whether you have a y chromosome) 99.99% (before you waste your time claiming it's AkShEwAlLy 99.98%, Google hyperbole) of the time. You can be a genotype male and present as a phenotype female. Your sex in this case is male, but your doctor would have filled out your birth certificate as female.

You just do not have any idea what you are talking about about but seem unwilling to let that stop you. It's that simple.