premiumMessagingPartitions

Specifies the number messaging partitions. Only valid when sku is Premium and the minimum number is 1. Possible values include 0, 1, 2, and 4. Defaults to 0 for Standard, Basic namespace. Changing this forces a new resource to be created.

Note: It's not possible to change the partitioning option on any existing namespace. The number of partitions can only be set during namespace creation. Please check the doc https://learn.microsoft.com/en-us/azure/service-bus-messaging/enable-partitions-premium for more feature restrictions.