@Vincent-TP recommended solution is wrong that post never actually provided a solution

@europe HI , this is version 4 eap 225 access points ,i am referring to. We have changed the router now after previously changing the oc200 and we have also put one of the ap's onto a poe injector...

Reset all the devices ie all access points with a pin then you can adopt them and then use the password on the OC

Had this issue a few times now on a few different sites Eap 225 version 4 firmware 5.1.6, switch SG2428P v5.30 , ER605 Router , OC 200 june last year we have had a site that had 12 ap's and had an...