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Fix SharePoint Graph API Upload Token Errors in Lasernet
Question details
Formpipe Lasernet fails to upload invoices to SharePoint due to empty or invalid authentication tokens, despite the user having site-owner permissions.
- Product
- Formpipe Lasernet / SharePoint
- Device & OS
- not provided
- Scenario
- Uploading invoices to SharePoint via the Graph API connector in Formpipe Lasernet 10.8.
- Observed behavior
- The initial connection to SharePoint succeeds, but the invoice upload fails with an 'Access Token is empty' or 'Invalid Authentication Token' error. Additionally, the upload URL is missing.
Before troubleshooting, gather your Lasernet Graph API connector version details, your Azure AD authentication configuration, and a complete copy of the error logs generated during the failed upload.
Engage the SharePoint Developer Community for Custom Connector Troubleshooting
Because this issue involves the Microsoft Graph API connector and third-party custom development (Lasernet), resolving token handling issues requires specific developer-level diagnostics.
Graph API authentication failures in enterprise integrations often stem from expired OAuth tokens, misconfigured Azure App Registration permissions, or connector bugs in handling token lifecycles. Standard SharePoint UI permissions do not govern API access tokens.
Check your Formpipe Lasernet 10.8 settings and note down the exact version of the SharePoint Graph API connector you are currently using.
Reproduce the upload error and export the application logs. Specifically, look for the HTTP response headers and the exact payload where the 'Access Token is empty' error triggers.
Navigate to the Microsoft SharePoint Developer Community or Formpipe support forums. Create a new thread providing your connector version, authentication configuration, token behavior, and the complete error details for expert assistance.
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Frequently Asked Questions
Why does Lasernet say 'Access Token is empty' when uploading to SharePoint?
This error usually occurs when the OAuth authentication token expires, isn't passed correctly by the Graph API connector during the upload phase, or the Azure App Registration lacks the necessary API permissions to generate a valid token.
Does having SharePoint site-owner permissions prevent API token errors?
No. Site-owner permissions dictate access through the SharePoint web interface. API uploads rely entirely on OAuth tokens and backend App Registration permissions, which operate independently of user-level UI permissions.
How do I check the authentication configuration for my Graph API connector?
You need to log into the Azure Portal and review the Azure Active Directory (Entra ID) App Registration used by your Lasernet integration. Check the configured API permissions, client secrets, and ensure admin consent has been granted for the required Graph API scopes.
