What's happening?
An error occurs when attempting to activate double opt-in within the compliance profile.
Reason:
The brand profile had no default sender provisioned, or multiple default senders were provisioned across different brand profiles.
Resolution:
Ensure that exactly one default sender is provisioned for the brand profile. Provision a default sender if none exists, and remove additional default senders if multiple are provisioned across different brand profiles.
- Navigate to Settings -> Brand profiles.
- Select the brand profile being used.
- Click on the Senders tab. Verify there is a sender and it is marked as default.