My understanding is that AIS in any form is not something that is apparent at birth, so failure to diagnose it is probably more common than uncommon. While fairly rare, current estimates run somewhere around 1 in 20,000 XY "males."
And at least one of the
AIS resources I looked at seemed to suggest (and make some baseless assumptions) about PAIS incidence that left me wondering whether anyone edited the site.
Better to consult a qualified doctor than go by what the rest of us are likely to pass along from secondary sources?
There are quite a few other possible conditions, so it's almost pointless to speculate in depth unless you have some more objective feedback, test results and confirmation of what has happened to you individually and have confirmed that those looking at your case have been thorough, are well-informed, and are not acting out of some social prejudice.
Reading literally, the current SOC is supposed to rule out organic causes, but given the state of current research, and obvious social prejudices, I've come to expect very little in the way of due diligence from people when dealing with either transgen or intersex conditions, which have sometimes sought separate status, in part acting out on the social stigma and prejudices involved, though there are also practical concerns, such as coercive socialization to consider when digging into this and looking for best practices in coping with one's own state of being.