Hi,
Poll type set to ZTP+ will work only if you are running CC 3.0, version that you need to install in the firmware tab of EMC 8.0. You can download it from Extreme github. Please note, CC 3.0 doesn't work with EMC 7.0 and before.
CC 3.0 is not required for ZTP+ to work. EXOS includes a version of CC natively (1.x - depends on EXOS version) since 21.1 to perform the ZTP+ feature.
if you confirm that:
- the switch is in factory default
- it's not a stack
- it runs at least 21.1
- there's no default.xsf nor autoexec.xsf files
- it can reach DHCP, have an IP and DNS options
- it can reach DNS to resolve extremecontrol (IP of EMC)
then you need to connect to it, go under the cc_logs directory (cd cc_logs), and upload the files you should find there. They should tell what is going wrong.