You are missing a v5 header
Requests
For client IDs created on or after May 31, 2019, the only available version of the Kraken API is v5. For client IDs created prior to May 31, 2019, use the application/vnd.twitchtv.v5+json header on your requests to access v5 of the Kraken API.
You need to update your .getJSON calls to send the Accept and Client-ID headers