I definitely recommend checking if you can reset the second AP to factory settings using reset button.
If still no success, you need to open a support case with Ruckus. I see 2 possibilities:
1 -- APs have somehow half-broken firmware and need to be RMAed.
2 -- APs are from some specific service provider and are locked to this service provider settings (some bigger MSPs have specific locked firmware).
I suppose Ruckus support will be able to say by s/n if this is a case and will assist if it is a software/hardware problem - to RMA as a last effort.
If AP is locked by MSP, then you are probably doomed, as Ruckus support will not help you reset it or RMA it, as such APs are not expected to be available for public use, but only as a part of service, so only MSP can request RMA for them.
I would say also that decision of replacing all IT by "full Cisco solution" has been seen in some cases of IT team change, and has nothing with the quality of previous solutions, but is a result of personal connections of new management with Cisco sales staff and will to spend a lot of money.
And there is no dispute that for WiFi migration from Ruckus to Meraki is not an improvement even if you replace 5-year-old Ruckus APs by the newest Meraki.
In a good condition Meraki even works, but in difficult RF conditions, it is a bit different story.
One more idea -- ask "previous admin" about IP settings and credentials for APs. If you will be able to connect by SSH with old IP settings and credentials, you'll probably be able to reset AP and/or replace firmware (if it is not MSP locked version).