Forum Discussion
Update from January 2023 to September 2023, now data-driven subscriptions not emailing!
In the meantime we have found out that the problem is caused by the fields in the dataset that contain the "NULL" value. For instance, if the field [CC] is used in the data-driven subscription, but you don't have always an email to send to, and you leave NULL in the [CC] column of the dataset, then the email will not work. If you set the [CC] column to empty (delete the NULL), then the email will work again.
In the meantime we have found out that the problem is caused by the fields in the dataset that contain the "NULL" value. For instance, if the field [CC] is used in the data-driven subscription, but you don't have always an email to send to, and you leave NULL in the [CC] column of the dataset, then the email will not work. If you set the [CC] column to empty (delete the NULL), then the email will work again.
Thanks so much Anonymous for this answer it also works for us!
Microsoft - add this to your breaking changes list on this update!