Error: This Integration Is Not Eligible to Use the Legacy /v1/requestToken Endpoint

Issue

While setting up my connector, setup tests fail with the following error:

{"message":"This integration is not eligible to use the legacy /v1/requestToken endpoint because the integration uses enhanced OAuth 2.0 functionality. To obtain a token for this integration, use the applicable Marketing Cloud OAuth 2.0 endpoint for authentication. For a web or public app, use /v2/authorize and then /v2/token. For a server-to-server integration, use /v2/token.","errorcode":10007,"documentation":""}

Environment

Connector: Salesforce Marketing Cloud

Resolution

To resolve this issue, do the following:

1. In Fivetran, go to your Salesforce Marketing Cloud connector page.
2. Select the Setup tab.
3. Click Edit connection details.
4. Set the Is Enhanced Installed Package toggle to ON.
5. Click Save & Test.

Cause

This issue occurs when your Salesforce Marketing Cloud instance utilizes enhanced OAuth 2.0 functionality and is not eligible to use the legacy /v1/requestToken endpoint. Enabling the Is Enhanced Installed Package option allows us to obtain a token for your account through the appropriate endpoints using OAuth 2.0.