Topic Name Invalid

The topic name provided is not malformed but is not accepted by the server or client. Used in CONNACK, PUBACK, PUBREC, and DISCONNECT packets when a topic name violates server policy.

References

docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html

In this namespace

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SharedSubscriptionsNotSupported SubscriptionIdentifiersNotSupported Success TopicAliasInvalid TopicFilterInvalid TopicNameInvalid UnspecifiedError UnsupportedProtocolVersion UseAnotherServer WildcardSubscriptionsNotSupported