Why this happens
Salesforce recently introduced a new permission called “Approve Uninstalled Connected Apps.”
If your Salesforce org doesn’t have the Mixmax Connected App installed — or your profile doesn’t include this permission — Salesforce will block the connection between Mixmax and Salesforce.
How to fix it
You can resolve this issue in one of two ways, depending on your Salesforce setup.
Option 1: Have your Salesforce Admin install the Mixmax app
If Mixmax isn’t already installed in your Salesforce org:
Ask your Salesforce Admin to follow the steps in our guide: Enable Salesforce to use the Mixmax app
After installation, confirm that the Mixmax app appears under Setup → Connected Apps OAuth Usage.
Retry connecting Mixmax — it should now work!
Option 2: Ask your Admin to grant you the missing permission
If Mixmax is already installed but you’re still seeing the error:
Ask your Salesforce Admin to open your Profile or Permission Set in Salesforce.
Under System Permissions, enable Approve Uninstalled Connected Apps.
Retry connecting Mixmax — the connection should now succeed.