Issues with setting up API Shield JWT Token Validation (error 500)

  {
    "kid": "ca96ae653935dbfb49b4e19de600cc5f9d5c63e3ac2dbee406ed4bf0ae100cce",
    "kty": "RSA",
    "alg": "RS256",
    "use": "sig",
    "e": "AQAB",
    "n": "9dG9Ph4ffncvEA9FO9pVMfJ1dh_5mtuyiIE4ap9ScrufVPq1I34St_dhcFavKiytK7Id7gTlgQgaouoJ0I5OJ_bytgX-B7oOUQHO-nJOAMycORXN8ZNaMBPKg9nBLL_BFY0YX5HggqrkXkZjJ--R4JpB30ENS8A6hxmEJ__yGMZTE2LHZoiYj9iyGNu3s3JflAoRlmziI8LsFXwyFAJUWRZq4SkSfyrRJ89pXPxIqBn9uYBtnxWzUpWG3xKZu0JAbi9YiwFCJrSe_CarvpARoWsOldtrty5yT1yJ1PZlImlF-yuEwjOoZxeib4WSidABZH0O3pbDACo8MfxR5rghHQ"
  }

curl -X POST "https://api.cloudflare.com/client/v4/zones/zone_id/token_validation/config" -H "Authorization: Bearer api_token" -H "Content-Type: application/json" -d '{"token_type":"JWT","title":"JWTs","description":"JWTs","token_sources":["http.request.headers[\"cf-access-jwt-assertion\"][0]"],"credentials":{"keys":[{"kid":"ca96ae653935dbfb49b4e19de600cc5f9d5c63e3ac2dbee406ed4bf0ae100cce","kty":"RSA","alg":"RS256","use":"sig","e":"AQAB","n":"9dG9Ph4ffncvEA9FO9pVMfJ1dh_5mtuyiIE4ap9ScrufVPq1I34St_dhcFavKiytK7Id7gTlgQgaouoJ0I5OJ_bytgX-B7oOUQHO-nJOAMycORXN8ZNaMBPKg9nBLL_BFY0YX5HggqrkXkZjJ--R4JpB30ENS8A6hxmEJ__yGMZTE2LHZoiYj9iyGNu3s3JflAoRlmziI8LsFXwyFAJUWRZq4SkSfyrRJ89pXPxIqBn9uYBtnxWzUpWG3xKZu0JAbi9YiwFCJrSe_CarvpARoWsOldtrty5yT1yJ1PZlImlF-yuEwjOoZxeib4WSidABZH0O3pbDACo8MfxR5rghHQ"}]}}'

{"result":null,"success":false,"errors":[{"code":10500,"message":"Internal Server Error"}],"messages":[]}