Can't connect 6th Extender to Archer A7 for OneMesh
I have a brand new Archer 7 router. I have successfully added 5 TPLink Extenders (RE220 | AC750 Wi-Fi Range Extender). I can see everything working fine on the iOS Tether app and on the A7 router dashboard through a browser. However, when I add a 6th Extender (shown below as RE220 and as LivingRoom), I can see it on the iOS app fine (LivingRoom) , but on the A7 dashboard (RE220), it doesn't register under OneMesh. When I click ADD on the browser dashboard I get a message that says "FAIL". Is this a bug?
iOS
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Browser connected to Archer 7