RatOS v2.0.0... now unable to join network "RatOS"

Please help?
Downloaded 2023-03-03-RatOS-v2.0.0-raspberry-rpi64.img.xz from GitHub.
Flashed to micro SD card using balenaEtcher, as I did before with V1.2.4. No problems.
4 different computers (2 Windows 10, 2 iOS) all "see" RatOS, but all 4 say, "Unable to join network "RatOS".
Please, what am I doing wrong?
Thank you for any help.