The main issue with Meraki APoS is it doesn't broadcast site survey by default because the Site Survey mode isn't enabled.  To enable the site survey mode, you can follow these steps.

1. Claim AP via Serial Number

2. Make sure the AP can directly access Internet

3. Upon AP booting, connect to “Meraki Setup” SSID

4. Access http://ap.meraki.com to access the local configuration portal

5. Click “Configure” and enter the AP's Serial #

6. Enable site survey mode and set channel and power accordingly.  Typically we set 14 dBm for 5GHz and 7 dBm for 2.4 GHz

7. AP will reboot and broadcast survey SSID (single SSID with both 2.4 and 5)