If there is no matching filter when a Topic Subscription receives a message then the message is lost. If the EnableFilteringMessagesBeforePublishing is to true on a Topic. Then a message without a Topic Subscription throws a NoMatchingSubscriptionException. . Unfortunately Microsoft do not recommend using this in production.
Description
If there is no matching filter when a Topic Subscription receives a message then the message is lost. If the EnableFilteringMessagesBeforePublishing is to true on a Topic. Then a message without a Topic Subscription throws a NoMatchingSubscriptionException. . Unfortunately Microsoft do not recommend using this in production.
See my blog article here that describes the issue. https://www.connected-pawns.com/2019/02/10/azure-topic-subscription-filters/
cc @EldertGrootenboer