A:AnswerBoth are the latest WiFi 6 technology and 802.11ax compliant so they "should" work together. That's why there are industry standards, after all.
A:AnswerTry resetting the Netgear eax15 extender to it's original settings, using the reset port on the side of the unit, then try to reconnect to your router. If that doesn't work, then you have either a bad extender or a bad router?