One year later, finally I come to this hotel - Crystal Gateway Mariott.
They have a open SSID - MarriottBonvoy_Guest. As I stayed in another Mariott hotel and I have this SSID stored in my router. The wifi and portal for different Mariott hotels are a little different though.
I am using AXT1800 and everything go smoothly.
Repeater connects fine.
Wireguard and openvpn connect fine. Have good speeds.
But MT3000 with stock firmware 4.5.16 does not connect to the hotel wifi, for some reason. I cloned a mac address that has already been authenticated and it works OK. But the whole process is not good.
I have a new firmware under testing and it works fine. I have one more day to test and will report later.