401 InvalidAuthenticationToken: Access token has expired or is not yet valid.

Sajed Almorsy 10

We are using Microsoft Graph API to send Outlook emails.

The access token expires after ~1 hour, we refresh it with the refresh token and it works just fine.

However, sometimes, the access token is refreshed successfully, we see the new expiration date which is 1 hour in the future, but trying to use the newly obtained access token we get the following error:

401 InvalidAuthenticationToken: Access token has expired or is not yet valid. from

This doesn't happen every time we refresh the token, sometimes it works well for several months and then we get the above error.

the error says has expired or is not yet valid, it's not expired because the expiration date is 1 hour in the future by the time we see the error as it's just refreshed.

so we think it might be or is not yet valid, do we have to wait for some time before we start using the new access token, Any other suggestions?

ChristyZhang-MSFT 20,801 Reputation points Microsoft Vendor

2023-05-24T02:00:09.11+00:00

Hi @Sajed Almorsy ,

Looks like your issue is more related to Graph, please kindly understand that the Outlook tag here we mainly focus on general issues about Outlook desktop client. In order to better solve your problem, we will add "Graph App" tag.
CarlZhao-MSFT 36,891 Reputation points

2023-05-24T02:45:33.43+00:00

Hi @Sajed Almorsy ,

Check to see if your refresh token has expired.
Sajed Almorsy 10 Reputation points

2023-05-24T13:13:39.6533333+00:00

@CarlZhao-MSFT, the refresh token is valid, we use it to refresh the access token, and get the new access token, then we try to use the newly fetched access token but we get the error shown in the ticket

Again, this is not a persistent behavior, we usually are able to use the new access token but not always