Neopixel library on B523/B5som

i have a LED strip of WS2812B LEDs connected to my B523. Is there any chance
to get it running with the Neopixel library, that is approved by the community?
On my older E-Series boards the LEDs are running fine with this library, but with the B523
nothing works.
In the documentation of the neopixel lib is can find a table, where the B523 (B5som) is not compatible
but i can´t find any information, why this is so.