Authorization required: sitemap.xml
Verification word: flight

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImZsaWdodCIsImp0aSI6ImRlMDY4YjMxNjdkZDQyMTU4N2E3OGM2MTA2YzFmODQ1IiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzkyODI3MjA4LCJleHAiOjE3OTI4Mjc1MDh9.FGSAVw2YTzZOrxjObfz0xjMUGQrT8UmZm8TbMH_ArrY

(No browser on this box? Cmd-click that link to open it on your laptop;
 it shows a QR you can scan with your phone.)

Then fetch the file -- this command waits until you approve:
  curl -fL 'https://serves.ck1.me/sitemap.xml?grant=eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImZsaWdodCIsImp0aSI6ImRlMDY4YjMxNjdkZDQyMTU4N2E3OGM2MTA2YzFmODQ1IiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzkyODI3MjA4LCJleHAiOjE3OTI4Mjc1MDh9.FGSAVw2YTzZOrxjObfz0xjMUGQrT8UmZm8TbMH_ArrY' -o 'sitemap.xml'