By default, the quota for consumer groups is twice the quota for topics.

By default, the quota for consumer groups is twice the quota for topics. For example, if you can create a maximum of 50 topics on your Message Queue for Apache Kafka instance, you can create a maximum of 100 consumer groups on the instance. To create more consumer groups on your instance, you need to purchase more topics. Each time you purchase a topic, a quota of two consumer groups is added. For more information, see Upgrade instance specifications.