#1
help me where is fail line, go to allegro.pl and help me fix please

 
Code:
REQUEST POST "https://allegro.pl/login/authenticate" 
  CONTENT "{\"username\":\"<USER>\",\"password\":\"<PASS>\",\"authorizationUri\":\"https://allegro.pl/auth/oauth/authorize?client_id=tb5SFf3cRxEyspDN&redirect_uri=https://allegro.pl/login/auth&response_type=code&state=nMXJND\",\"authenticationMethod\":\"CREDENTIALS\"}" 
  CONTENTTYPE "application/json" 
  HEADER ": scheme: https" 
  HEADER "accept: application/json, text/plain, */*" 
  HEADER "accept-encoding: gzip, deflate, br" 
  HEADER "accept-language: pl-PL,pl;q=0.9,en-US;q=0.8,en;q=0.7" 
  HEADER "content-length: 257" 
  HEADER "dpr: 1" 
  HEADER "origin: https://allegro.pl" 
  HEADER "referer: https://allegro.pl/login/form?authorization_uri=https:%2F%2Fallegro.pl%2Fauth%2Foauth%2Fauthorize%3Fclient_id%3Dtb5SFf3cRxEyspDN%26redirect_uri%3Dhttps:%2F%2Fallegro.pl%2Flogin%2Fauth%2F%26response_type%3Dcode%26state%3DiD3Y02&oauth=true" 
  HEADER "sec-fetch-dest: empty" 
  HEADER "sec-fetch-mode: cors" 
  HEADER "sec-fetch-site: same-origin" 
  HEADER "user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36" 
  HEADER "viewport-width: 1366" 
  HEADER "x-fp: 51a93e156c7c07d8e02334f792790f6a"