Wi-Fi Issues

[loojinwei7]

Hi, my iPhone and iPad are having issue with wifi after I changed my router yesterday. I can connect my Apple devices to wifi on either the main router or the access point, but there is no internet service regardless of wifi connected to. All other devices, e.g. Samsung phones, laptops and desktop, have no issue with wifi on both routers.

My setup as such:
Before yesterday
MyRepublic Halo as main router connected to modem in living room. MyRepublic wifi Hub connected to the Halo and setup as access point in bedroom.

Current
Asus RT_AX3000 as main router connected to modem in living room. MyRepublic Halo connect to the AX3000 and setup as access point in bedroom.

All SSIDs and passwords remain the same before and after the routers switch.

I have tried resetting network setting on the Apple devices, forget network and reconnect, restarting modem and routers, restarting the Apple devices, but to no avail. Wifi works when my Apple devices are connected to other hotspots.

I also noticed that my Apple devices connected to the routers are listed on the connected device list on both routers management page.

I have also tried some other troubleshooting tips suggested by Google, but also no use.

I would like to seek help with regard to the above please. Thank you in advance.