API v2 always INVALID_TOKEN

API v2 always INVALID_TOKEN

Hello, I am getting api error -
  1. {
        "code": "INVALID_TOKEN",
        "details": {},
        "message": "invalid oauth token",
        "status": "error"
    }

1. I registered in the user’s account and using Self-Client with the rights ZohoCRM.settings.all, ZohoCRM.settings.modules.all and received a grant token.

2. After I generated access_token and refresh_token

  1. {"access_token":"1000.************.************","refresh_token":"1000.************"","expires_in_sec":3600,"api_domain":"https://www.zohoapis.eu","token_type":"Bearer","expires_in":3600000}

3. Using this access_token I want to get data by api. But I get this error - INVALID_TOKEN.

-H Authorization: Zoho-oauthtoken 1000.*****************.******************************

4. I updated access_token many times using refresh_token and immediately used it in api, but I get the same error. It cannot be that I did not use a fresh token, I always used the most recent one.

  1. {"access_token":"1000.******************56.ab1***************8e","expires_in_sec":3600,"api_domain":"https://www.zohoapis.eu","token_type":"Bearer","expires_in":3600000}


Please tell me what could be the problem? How to get rid of this 401(invalid token) and get a normal answer?