Unable to exchange short live token for long live token instagram gragh api

i got the access token but while exhangeing it for long live token api getting following error

error: { message: 'Unsupported request - method type: get', type: 'IGApiException', code: 100, fbtrace_id: 'AnMYrIXYSTKYCA_Sh2qKxkU' }

const accessTokenApi = {             url: 'https://api.instagram.com/oauth/access_token',             method: 'post',             headers: {                 'Content-Type': 'application/x-www-form-urlencoded'             },             body: new URLSearchParams({                 code: code,                 redirect_uri: instagramConfig.callbackUrl,                 client_id: instagramConfig.clientId,                 client_secret: instagramConfig.clientSecret,                 grant_type: 'authorization_code',             }).toString(),         };         const tokenResponse = await this.apiCall(accessTokenApi); const userPlatform = await this.userPlatformService.getUserPlatfromsByCode(userId, "INSTAGRAM");         const userLongLiveTokenApi = {             url:`https://graph.instagram.com/access_token?grant_type=ig_exchange_token&client_secret=${instagramConfig.clientSecret}&access_token=${userPlatform.authToken}`,             method: 'get',             headers:{}         }         console.log(userLongLiveTokenApi)         const userLongLiveTokenResponse = await this.apiCall(userLongLiveTokenApi);