'XHR post request responds with 401, urlencoded data

I'm trying to make a post request using the following converted from CURL bash:

headers = {
    'authority': 'www.discoverecentral.com',
    'accept': '*/*',
    'accept-language': 'en-US,en;q=0.9',
    'content-type': 'application/x-www-form-urlencoded',
    # Requests sorts cookies= alphabetically
    # 'cookie': 'COOKIE_SUPPORT=true; GUEST_LANGUAGE_ID=en_US; _ga=GA1.2.976004968.1651680892; _gid=GA1.2.1647177146.1652091069; ak_bmsc=376E16054B8CE1667585CF4B843B1281~000000000000000000000000000000~YAAQVJPIF87oQqyAAQAA5y8jrQ9DHy/4GZJUo1mSNg5U7s7R0A1ATGV+bFMIIp99MPTSGgwRJbLppQ33OtTnvp4dT1gF31OZ01N5b7SAvYbzGh6p1JHCPRkuLI7LI/yDQ/Y24KBTfsRYeTkILDOlI948yMwXay1lXdXMwVmiUOhfUV1TqPoS/kuHVjF+Pu5TYaGVoHmz2tARel9ydbLCv44P+yYkEssPPJanuEtdg3A3IYXH4SzSbaqhN+yV2OmwbYj9C4rHP3Vb1R7g2zQAKzS8Z+kwdV5Ns13EVuFPb+bVNxAKUIsnMKy7Lpxa05e+l38JktfKWtto7bBkfAzH7FyibI/6iyCvw/cghpDaE/PkXqXZDZh6GFWkVUABzngytkXRkS1aTG9VwhBJap2iJbWaVvA=; SAML_SP_SESSION_KEY=_bd42396230f077643c06f7bb75c60202169a8011748d5bf587745d054563; JSESSIONID=429078A672F540F1159490C033065E11.jvm6; _gat=1; bm_sv=237874D0F3F147A8B5E9FE30ABD61E37~YAAQVJPIFxrtQqyAAQAA/dqCrQ8Pjm4VHd954FLp0cvcoavAJFayiPFK25Q0lEeLQz4Ejuy7Q2GTzcT1DC0xhWkz2XAC6zLrqBc93TFAOG9zTjPZFqUTKfu9XplU5QowZlz76ekHhvprJpnen+rsaOPGScci0EPsUaU4LXyknJADa97lizWyy/1RpFDuSUnspML6cYGOBwVmpVs3EM13bfVQCuB7r4li7iMJ0toY6hl30+YIzwF7ESB1xrlwvl59Uvumf3j4w4UC1kw=~1; LFR_SESSION_STATE_4814701=1652178477701',
    'origin': 'https://www.discoverecentral.com',
    'referer': 'https://www.discoverecentral.com/group/merchant/my-reports',
    'sec-ch-ua': '" Not A;Brand";v="99", "Chromium";v="101", "Google Chrome";v="101"',
    'sec-ch-ua-mobile': '?0',
    'sec-ch-ua-platform': '"Windows"',
    'sec-fetch-dest': 'empty',
    'sec-fetch-mode': 'cors',
    'sec-fetch-site': 'same-origin',
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.54 Safari/537.36',
    'x-requested-with':'XMLHttpRequest',
}

params = {
    'p_p_id': 'DiscoverMyReportPortlet_WAR_discovermyreportportlet',
    'p_p_lifecycle': '2',
    'p_p_state': 'normal',
    'p_p_mode': 'view',
    'p_p_resource_id': 'retreiveHierarchyList',
    'p_p_cacheability': 'cacheLevelPage',
}

data = '&direction=des&orderBy=Default&selectedLocalEntityId=6011&gridPageSize=5000'

response = s.post('https://www.discoverecentral.com/group/merchant/my-reports', params=params, headers=headers, data=data)

The response is a 401 unauthorized. I know it has something to do with the structure of the data being passed into the request. Anyone come across a similar issue?

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'XHR post request responds with 401, urlencoded data

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