Issue

When creating an activation to in Segment audience to a destination, users may encounter the following error, which blocks them from creating the activation:

Response not successful: Received status code 409

Product

Segment 

Environment

Segment Console

Cause

Each destination instance in Segment has a hard limit on the number of mappings (activations) it can support. Once that limit is reached, any attempt to add a new activation to the same destination instance fails with a 409 error. This mapping limit cannot be increased.

Resolution

Confirm the destination has reached its mapping limit by checking the number of existing mappings on the destination instance. If unused mappings exist, remove them to free up space. If all mappings are in use, create a new instance of the destination. Use the Copy settings option to copy configuration from the existing instance.

Add the activation again, selecting the new destination instance.

Additional Information 

There is currently no proactive alert when a destination is approaching its mapping limit this has been logged as a product improvement request.