Just wanted to report that my eero pro 6 with wpa3 activated didn’t allow an older Apple TV and a august connect device to connect, the devices were indicating invalid password, worked ok with wpa3 off.
Thank you for reaching out to us and welcome to the community! I was able to verify that some AppleTV devices that are on older software do not support WPA3. Have you checked to see if there are any updates? In regards to the August devices you might want to check with the manufacturer to see if it supports WPA3.
Do you have other devices that are able to connect with WPA3 enabled? This would be an easy way to identify if the cause is with the connected device or with the eero network.