@TGC68 So, it would seem that the latest version of the Deco app (Android at least) has fixed the issue with my M9 devices not connection the nearest Deco 🤔 I did miss a post relating specifically...

Same... I'm running a network with 1 x M5 and 3 x M9 plus. The M5 upgraded this morning to firmware v1.6 and I can now select the source. The M9s on the other hand, remain at version 1.5.6 (a build...

@Tp-link I thought I was going mad until I found this thread! I've just replaced my three Deco M5 devices with M9 Plus (not a particularly cheap option) to resolve an issue where one device got such...