{"reason":"Invalid Token!","error":"invalid_grant"} error when refreshing access token

API and Webhooks Authentication
1

API Endpoint(s) and/or Zoom API Event(s)
Endpoint: https://zoom.us/oauth/token
Method: POST
Authorization header: Convert.ToBase64String(Encoding.UTF8.GetBytes($“{_zoomOptions.ClientId}:{_zoomOptions.ClientSecret}”));
Body:
x-www-form-urlencoded
grant_type=refresh_token&refresh_token=<refresh token issued 1-2 hours ago>

Description
Our platform uses Zoom API to create meetings on behalf of a user. When the user establishes an integration, we receive a valid access token that can be used to create events on behalf of the user.

Error
When we try to refresh the token with the refresh token issued 1-2 hours ago, we receive the {"reason":"Invalid Token!","error":"invalid_grant"} error. I double-checked all the credentials. The code has not been changed since 2023

2

Hi,

Most likely the refresh token being used is no longer valid. Could you try to reauthorize the app and obtain a brand new bearer token and refresh token.

Cheers,
Harsh
Fario Consulting

3

We discovered that users can have only one access/refresh token pair per Zoom application. When the same user requests a new access/refresh tokens pair, the previous one expires instantly. I haven’t found mentions of this behavior in the documentation