I have just spent about five hours today trying to trouble shoot re-setting up my network using 3 Eero Pro 6 and one Eero Beacon. They are running 6.6.1-2. I was trying to do the setup using my iPhone with the Eero App. The app version is 6.14.1 92405) and I am running iOS 15.2 on an Iphone 12 Pro Max. It would consistently get stuck at the registering stage and go no further. Finally, I was googling about and saw that some people in the past had had issues with setup using iOS and succeeded using Android. I found an Android phone that I used for travelling and installed Eero. The Android app version is 6.14.1.36466. I am so pissed off. I cannot understand why you would not make damn sure this worked on iOS. If someone asked me what I thought of Eero now, I would tell them now to waste their money on junk software from a bunch of rank bloody amateurs.