Migrate from Legacy API to modern API for Secure Access and Umbrella DNS Redirection on Network Devices

Legacy API tokens in Umbrella were to be discontinued back in september 2023, but was put on hold due to low adaption rate onto the new and more secure regular API key format. If you're migrating or starting on Cisco Secure Access the legacy API tokens is deprecated and no longer in effect, this means customers are forced into using the more modern API key approuch