Help with RBR750p set up

Help! I’ve wasted 3 nights trying to replace my older Orbi router and satellites with the RBR750p router and satellites. I was successful with getting the router working, renamed the wireless network, and created my admin password but neither of the 2 satellites worked. In the app, they were showing offline and noticed the serial numbers were wrong and likely the numbers of my old satellites. I called the support number but really didn’t get much help. I decided to delete the app, re-download it, and even created a new netgear account to wipe everything. When I tried again after downloading the app, to connect the router to the modem, the “ORBI81” network now can’t be found. I can’t even get past this step to try connecting the satellites.  I’m at a loss as to how to set up this system. It shouldn’t be this difficult. Any suggestion greatly appreciated!