@David-TP Thanks for coming back to me. In the end I deleted the network and set it up again on the primary XE75 Pro. Once configured, I added the remaining units. All seems to now be working as...

I've recently migrated from the M4R model to the XE75 Pro. I followed the process for case 2 here to setup the new deco - https://www.tp-link.com/us/support/faq/2400/ Migration seemed to work as...