Also look at the access points ethernet port. I had a batch that had a problem with one of the pins collapsing. So they powered up but would not connect to the network. Even worse was they worked at my office when I prepped them (first time plugged in) then at the site, no go. Tersted cabling, replaced a couple then found this issue on a forum since MR3X models. I had 30 out of 1000 that ended up like this.
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