diff --git a/docs/guides/operator-guide-aws-marketplace.md b/docs/guides/operator-guide-aws-marketplace.md
index 21f39b0a9..03ebc9128 100644
--- a/docs/guides/operator-guide-aws-marketplace.md
+++ b/docs/guides/operator-guide-aws-marketplace.md
@@ -361,12 +361,16 @@ The following table includes some additional commands that might help you manage
## UID2 Operator Error Codes
-The following table lists errors that might occur during a Private Operator's startup sequence.
+The following sections list error codes that might occur during a Private Operator's startup or runtime.
:::note
-Error codes for Private Operator startup issues are applicable only to release v5.49.7 and later.
+Error codes for Private Operator issues are applicable only to release v5.49.7 and later.
:::
+### Startup Errors
+
+The following errors occur during operator startup:
+
| Error Code | Issue | Steps to Resolve |
| :--- | :--- | :--- |
| E01 | InstanceProfileMissingError | Attach an IAM instance profile to the EC2 instance with the required permissions. The UID2 Operator needs these permissions to access configurations from AWS Secrets Manager. |
@@ -376,6 +380,12 @@ Error codes for Private Operator startup issues are applicable only to release v
| E05 | OperatorKeyValidationError | Ensure the operator key is correct for the environment and matches the one provided to you. |
| E06 | UID2ServicesUnreachableError | Allow UID2 core and opt-out service IP addresses in the egress firewall. For IP addresses and DNS details, refer to the logs. |
+The following errors occur during operator runtime (after startup):
+
+| Error Code | Issue | How to Identify in Logs | Steps to Resolve |
+| :--- | :--- | :--- | :--- |
+| E12 | Data Download Failure | Look for log messages containing `"E12: Data Download Failure"` along with `"Failed to load"` errors from `RotatingStoreVerticle`. These will include HTTP status codes (e.g., `"HTTP response code 403"`) or exception types (e.g., `"exception: IOException"`). | Check the HTTP status code or exception in the error message:
**404 errors** - Verify operator key is valid and configuration paths are correct.
**403 errors** - Check IAM permissions for S3 access and verify operator credentials.
**Timeout errors** - Verify network connectivity, check firewall/security group settings allow outbound HTTPS, and ensure UID2 service endpoints are accessible.
**500 errors** - Temporary UID2 service issue, retry or contact UID2 support if persistent. |
+
## Technical Support
If you have trouble subscribing to the product, or deploying, [contact us](mailto:aws-mktpl-uid@thetradedesk.com).