Refresh token issue

Question

1. User is getting logged into the azure active directory application from the popup that appears on the frontend
2. Access token is generated from MSAL library and I am trying to get the refresh token from the sessions
3. Then the tokens are saved in the database
4. User clears the cache
5. Token is expired after 1 Hour
6. Need a way to refresh the token in the backend api, but getting into the errors like: invalid grant, client is not valid, request malformed

How can i generate the meeting links from the backend api?

Below is the error i am getting here mostly!!
{
"error": "invalid_grant",
"error_description": "AADSTS9002313: Invalid request. Request is malformed or invalid.\r\nTrace ID: e088b1fa-8902-41ad-a559-73e6facd2c00\r\nCorrelation ID: d300ab19-bbe3-4dad-b225-50aad7258d05\r\nTimestamp: 2021-11-17 14:52:06Z",
"error_codes": [
9002313
],
"timestamp": "2021-11-17 14:52:06Z",
"trace_id": "e088b1fa-8902-41ad-a559-73e6facd2c00",
"correlation_id": "d300ab19-bbe3-4dad-b225-50aad7258d05",
"error_uri": "https://login.microsoftonline.com/error?code=9002313"
}