value 'string' lost in original post for provided fields. I have same values for 'code' and 'authorization_code' fields.

Hello, I have an issue with oauth. My request to https://account.windy.com/auth/token has in the body such fields:
{
client_id: ,
client_secret: ,
grant_type: 'authorization_code',
code: ,
authorization_code:
}
I expect to get correct token, but actually get:
{
"error": "server_error",
"error_description": "Authorization Code Not Found"
}
Are there other required fieds, or some misspell? Any other ideas about why doesn't that work?