SYMPTOM:
After migrated from Narrowcast to Distribution Services, some scheduled subscriptions are missing. Only contacts, devices and transmitters related to these missing subscriptions are migrated to Administration -> Delivery Managers
CAUSE:
It is as designed. There are differences between the subscriptions supported by Narrowcast and Distribution Services. Only web delivery subscriptions from Narrowcast can be migrated to Distribution Service, while non-web delivery subscriptions are not supported by Distribution Services, which are not migrated. For non-web delivery users, there is a setting to choose migrate or not, as shown below.
WORKAROUND:
Migrate web delivery subscriptions to Distribution Services and keep Narrowcast for non-web delivery subscriptions.
