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The issue you’re facing is common when the access token, which is designed to expire after an hour, needs to be refreshed. If you see an “invalid_grant” error, this is usually because the refresh token is either expired or was revoked.
First, ensure that your system’s clock is synchronized with a network time server, as time discrepancies can cause such issues. If the error persists, then obtain a new set of credentials by re-authenticating your application. The refresh token is typically returned the first time your application is authorized, so you’d need to prompt for re-authentication.
To ensure that your refresh token is valid for GA4, you may have to check with the application or system that generated it. The refresh token is specific to the client ID, client secret, and scopes that were included when the original access token was requested, and GA4 should technically be part of the scopes if it was included in your initial request.
There’s no specific call to refresh a refresh token, but you’ll get a new one each time you perform the initial authorization. So, to obtain a new refresh token, you’ll need to run through the OAuth2.0 flow again. Understanding this will help you handle token-related errors proactively in the future.
Lastly, remember that the refresh token can stop working for a number of reasons, including when the user revokes the token, the refresh token is not used for six months, or the user changed passwords.
