What happened?

The recipients couldn't unsubscribe from emailing because the unsubscribe link that contains legacy placeholders {unsubscribe} and {unsubscribe_link} in the invitation was inactive.

Affected period of time 17.11.2022 - 02.03.2023

Why did it happen?

The legacy placeholders {unsubscribe} and {unsubscribe_link} stopped working due to a bug in the system that occurred after 11.12.3 hotfix release.

What were we doing to resolve the issue?

In order to fix the problem we did migrations that updated the old legacy links with new placeholders inside the invitations email templates: {{questionnaire.unsubscribe}} and {{questionnaire.unsubscribe_link}}

What are we doing to avoid such issues?

We updated the legacy placeholders to the new ones and updated the help center articles to narrow the chance someone will be using the old ones. Additionally pay attention to legacy placeholders during the QA tests and implement validation for email templates to comply with actual formatting.