There is also a new Zero Touch deployment workflow in Early Access that allows bulk AP deployment where you can use a csv file.  AP Zero Touch Deployment - Cisco Meraki Documentation ... View more

You will need to upload the Root Cert of your PKI to Access Manager so client device cert's are trusted. The session logs in Access Manager should give failure reasons ... View more

I see there is a new feature in Early Access for AP Deployment and Swap outs - not sure if that will help you AP Zero Touch Deployment - Cisco Meraki Documentation -  More here - feature transferred over from Catalyst Center. The End of the "Staging Party": A First Step into AgenticOps - The Meraki Community   ... View more