Can’t use Orbi with iphone I have the rbr50

[jlcinga]

I have my rbr50 connected to an AT&T u-verse modem...model 5268AC FXN.
All was fine for a year or more...now I get 404 not found or unsecured website messages when using my iPhone.
I have reset Orbi, but no change.
I can switch to one of the AT&T wifi addresses and all is fine.
I have read other threads about this problem, but answers asking endless questions or talking about bridges and radios are no help to me.
Does anyone have a step by step solution.
I can follow directions, if they make sense.

[FURRYe38]

What Firmware is currently loaded?

Modem Combo Units:
This would be a double NAT condition which isn't recommended. https://kb.netgear.com/30186/What-is-Double-NAT
Couple of options,
1. Configure the modem for transparent bridge mode. Then use the Orbi router in router mode. You'll need to contact the ISP for help and information in regards to the modem being bridged correctly.
2. If you can't bridge the modem, disable ALL wifi radios on the modem, configure the modems DMZ/ExposedHost or IP Pass-Through for the IP address the Orbi router gets from the modem. Then you can use the Orbi router in Router mode.
3. Or disable all wifi radios on the modem and connect the Orbi router to the modem, configure AP mode on the Orbi router. https://kb.netgear.com/31218/How-do-I-configure-my-Orbi-router-to-act-as-an-access-point and https://www.youtube.com/watch?v=H7LOcJ8GdDo&app=desktop

I recommend you try option #3...Its the same mode my RBK50 system is running in. No iPhone troubles seen.