After upgrading from Strategy 2019 to Strategy 2020 and using the Configuration Wizard to upgrade the metadata to 2020, subscriptions begin to work incorrectly. For example, if there are three subscription recipients, then three copies of the same email will be sent to all recipients.
This is a known issue in Strategy 2020.
This issue is currently being investigated by Strategy's Technology team. For an immediate solution, use the following workaround.
To resolve this issue, Strategy recommends disabling the feature Group recipients in a single email when device and bucketing rules are the same.
