@iplr See if this post helps if not please get back to us https://www.tp-link.com/us/support/faq/2925/

@jagSparrow The following was taken from this post post where other users were having the same issue "Currently, some users have confirmed that restarting the ISP modem again after enabling the Guest...

@xcybermail Because your running your decos in AP mode you lose out on a bunch of options including "Device Isolation" that's why you are unable to find this option. Here is a list of what options...

@HomeNetwork123 See if this helps https://www.tp-link.com/us/support/faq/3297/#:~:text=Open%20the%20Deco%20app%2C%20go,part%20of%20the%20internal%20antennas.

@EZY123 Ah perfect! Glad I could help :)

@Simorame He wont be working for about 10 hours from now but going to ping David one of the tp-link staff members he can let us know if the beta firmware is safe to install for you or not :) @David-TP