Outlook API v2.0 refresh token

I am not able to get the refresh_token of a user.
I get below error

{

"error": "invalid_client",

"error_description": "AADSTS7000215: Invalid client secret is provided.\r\nTrace ID: 63866fff-7cb4-4299-adeb-fe3488281e00\r\nCorrelation ID: 192ce410-8742-4c59-9fb0-df2e5a3904a0\r\nTimestamp: 2020-03-23 07:42:22Z",

"error_codes": [

7000215

"timestamp": "2020-03-23 07:42:22Z",

"trace_id": "63866fff-7cb4-4299-adeb-fe3488281e00",

"correlation_id": "192ce410-8742-4c59-9fb0-df2e5a3904a0",

"error_uri": "https://login.microsoftonline.com/error?code=7000215"

}

Request body:

client_id:ef51e9ac-d64d-444c-b912-d13e739222f5
scope:https://outlook.office365.com/full_access_as_app
grant_type:refresh_token
client_secret:buqm46A0w9pMaJstsk-ilkioZxfAK[@[
refresh_token:OAQABAAAAAABeAFzDwllzTYGDLh_qYbH83FclXD3IeTsl0oCvvg2hhlAIwd0TtYuFDNgeenWgKYsSjm31oWQuy_Iho_AL16I5U55zp0V-Oy6-BXRRXVvQEz7YkTYURHt3SLdCaqK2gXWyGVoF82shsTfkT_XJpi-ObhD37GkLsnaq4HIrKTvO5MTzEFd0ESDQIOhIu2HGjxmqU8WOC9Ze4alfSnXUkPsIfzef6m2cEEyxOCxLwO1u59BjWT8zPIEcFaV3IR8q9vaUFPw4WSAD5-dORc11eiLFTEPu1NETumbbEwRs85_bns8hWJODv6OS74uQkCGgthMZGzFf_q04mAeJfDRU08eMzaKtjkQZyJAKZFqZVoZIQipXXJZ-xRa3vIW6uGH80QbD9cePO1ZKfwPS693DokAHum7hiTq81QGaVibGvj4J8ucU779wjLwLNdNOGV7jsnhTVPd5W2NXaRgf9uQKQm0K75wm8d_oKJY_rohs5ILvGX4UTLRBmVWKKCd25PgK2bOT05_DeF-A-44EEKk1rj0V-yPjTbiqw0lhS2cjGIigOUKgT6wDDSQlbUKpa5tTv20aXpGfsinVgksDC_lTJq8XPzGFQEdg0PCWtD1-k1xIXkDGi2WMa-XZBl4LdrEikyZk4HijMpfChtU97b7qN1pQz3bLerSmSyQ3d5YqrI6Ior60WMFzRoexx9BJrqawCnZAsFdtZWJ0B7-IJPoqNEyychIDoWC_sF02fcK9LmLxySOQh6AEGkkL_McenY1lfh5HAddxR-_blkC4EZt867x03JPuw4OOMHmFJ8TSchqhse_vptRY55c6Rq20EVYVIXwgAA

Can you plz help me out with the solution

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