A configuration has been made to add to every switch port a new port description.

An HTTP 429 status code indicates that too many requests have been sent in a given amount of time (“rate limiting”). In this context, receiving an HTTP 429 error message from the Meraki cloud after executing a script to add descriptions to every switch port suggests that:

B. The rate limit of the Cisco Meraki API is exceeded.

References := ( Automating Cisco Enterprise Solutions Official Cert Guide )