Most Common Issues with Salesforce Connected App in Veeam Data Cloud for Salesforce
| KB ID: | 4810 |
| Product: | Veeam Data Cloud for Salesforce |
| Published: | 2026-01-23 |
| Last Modified: | 2026-03-25 |
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Purpose
Solution
As of Autumn 2025, Salesforce has restricted the use of uninstalled connected apps (see Salesforce article). Due to these changes, customers may encounter errors when connecting a Salesforce organization to Veeam Data Cloud for Salesforce.
When authorizing Veeam Data Cloud in a Salesforce organization, Salesforce automatically creates the Connected App “VDC Salesforce Backup.” The user authorizing the connection must have the “Approve Uninstalled Connected Apps” permission. Without this permission, Salesforce will deny the connection.
Below are common errors that may occur during authorization or re-authorization, with steps to resolve them.
Connected App is not installed
Salesforce error code:
OAUTH_APPROVAL_ERROR_GENERIC
Resolution
- Ensure the user authorizing the connection has the “Approve Uninstalled Connected AppsFrom Salesforce Documentation: This new user permission is automatically assigned to the System Administrator standard profile. Custom profiles aren’t automatically updated, including those previously cloned from the System Administrator standard profile. After the connected app usage restriction is enforced in September 2025, this user permission grants access to use uninstalled connected apps, bypassing the new usage restriction. It should only be assigned to highly trusted users, such as administrators and those involved in managing or testing connected app integrations. Salesforce recommend using care when assigning this user permission. For example, only grant to admin users and to users who manage connected app integrations and need to test the apps before installing on the org for access by other end users.” permission, then retry the authorization.
- After the initial authorization attempt, Salesforce will create a connected app named VDC Salesforce Backup. Proceed to the Connected Apps OAuth Usage" page and click Install for the connected app in Salesforce. Then, try to authorize the Salesforce connection once again
- If this error occurs when connecting a sandbox organization, run “Match Production Licenses to Sandbox without Refresh.”
Connected App is not installed or is blocked
Salesforce error code:
OAUTH_APP_ACCESS_BLOCKED
Resolution
- In Salesforce, go to Setup, search for "Connected Apps," and select "Connected Apps OAuth Usage."
- Unblock or Install the “VDC Salesforce Backup” Connected App as needed.
User authorizing the connection is not approved to use the Connected App
Salesforce error code:
OAUTH_APP_ACCESS_DENIED
This error occurs if the Connected App is configured to allow only admin-approved users.
Resolution
- Create a custom permission set that grants access to the “VDC Salesforce Backup” Connected App.
- Assign this permission set to the user who will authorize the connection.
"VDC Salesforce Backup" is not allowed to connect to your organization
Salesforce error code:
BAD_REQUEST
This error occurs if "API Access Control" is enabled for the organization.
Resolution
- Ensure that the VDC Salesforce Connected app is installed.
- Ensure that the connected app is added to the list of allowed applications under: Setup > API Access Control
More Information
Additional Information About Authorization Errors
For more information about OAuth 2.0 Authorization errors, please review the Salesforce Help documentation:
Regarding the Future of Connected Apps
Starting with the Salesforce Winter '26 release, Salesforce will begin transitioning from Connected Apps to External Client Apps. For more information, please review this Salesforce article:
If this KB article did not resolve your issue or you need further assistance with Veeam software, please create a Veeam Support Case.
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