Hi Nathan, for the port state mismatch please open a TAC case.
For the LAN-A device configuration failure this **may** be more fundamental. After the new switch receives an IP address please consider confirming correct routing between DNA Center and the new switch. 1. Try pinging from the DNA Center CLI to the new switch DHCP address and then 2. In DNA Center > Provision > Plug and Play, the new switch should appear, please confirm it's there, if it's there in some error state from a previous LAN-A attempt you could try deleting the switch from PNP, or if it's pending authorization you could authorize the switch. 3. If you have DNA Center 2.3.5+ there's quite a bit of logging in LAN-A (DNA Center > Provision > LAN Automation), you could read through the LAN-A session logs to see what's going wrong.
If none of those things work then again, please open a TAC case.