Azure service bus cannot create topic from Azure portal

When I create Service Bus it doesn't allow me to Add new Topic

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How do you get the Service Bus connection string from Azure portal?

To get Azure Service bus connection string, Sign-in to Azure portal. Select the resource group in which the Service bus is residing. Select the namespace of the service bus queue/topic for which we need the connection string.

What is difference between queue and Topic in Azure Service Bus?

A queue allows processing of a message by a single consumer. In contrast to queues, topics and subscriptions provide a one-to-many form of communication in a publish and subscribe pattern. It's useful for scaling to large numbers of recipients.

Verify namespace you're creating is not on the Basic tier. Basic tier doesn't have topics. If that's not the case, then Azure support is the only option to find out what's wrong.