> For the complete documentation index, see [llms.txt](https://docs.stacksync.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.stacksync.com/connectors/salesforce/authorize-salesforce/fix-the-salesforce-oauth-error.md).

# Fix the Salesforce OAuth Error

<figure><img src="/files/I3jSfU8nHFTWLZOtng6V" alt=""><figcaption></figcaption></figure>

This happens because Salesforce requires the **Stacksync a**pp to be installed and approved in your **Organization** before anyone can use OAuth.

## Install the Stacksync App in Your Salesforce Org

Before any user can create a Salesforce connection in Stacksync, the **Stacksync** App must be installed in your Salesforce org. This step only needs to be done **once**.

#### 1. Make sure the installer has the required permission

The user who performs the first OAuth authorization **must** have the Salesforce permission:

**“Approve Uninstalled Connected Apps”**

To enable it:

1. Go to **Setup**
2. Search for **Profiles**
3. Open the profile of the user who will install the app\
   (e.g., **System Administrator** or any user profile with this permission)
4. Enable **“Approve Uninstalled Connected Apps”**

<figure><img src="/files/FA1LzEXYxlGG1qZnq6D0" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/7gsopKkLWP5uYPxsmGGA" alt=""><figcaption></figcaption></figure>

This permission lets the user approve and install connected apps.

#### **2. Perform the first OAuth authorization**

After the permission is enabled:

1. The user with that permission logs into **Stacksync**
2. Starts the **Salesforce OAuth flow**
3. Salesforce will show a prompt to **approve and install** the **Stacksync** App
4. Once approved, if you want other users in your organization to be able to install this app, go to **Setup → Connected Apps OAuth Usage**, find **Stacksync**, and click **Install.** After that, selected users will be able to authorize successfully.

<figure><img src="/files/DxmSs3Dr8G0USK5ZKcvm" alt=""><figcaption></figcaption></figure>

## **Other Users Can Now Use OAuth**

Once the **Stacksync** app is installed, other Salesforce users (for example, a dedicated “Stacksync Integration User” with limited permissions) should be able to complete the OAuth flow without any extra steps.

If a user still encounters an OAuth error, go to **Setup → Connected Apps OAuth Usage**, find **Stacksync**, click **Install or** assign access. After that, the user will be able to authorize successfully.

***

## **Final Result**

* **One user with the proper permission installs the app once**
* **All other allowed users can now use OAuth to create Salesforce connections in Stacksync**