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err:unkey:limits:custom_domain_limit_exceeded
Your workspace already has as many custom domains as your plan allows, so domains.createDomain didn’t add another one. You get HTTP 403. Waiting won’t change it.
Example response

How to fix

  1. Remove a domain you no longer use with domains.deleteDomain, or move to a plan with a higher limit. See Limits and Plans. To see your domain count and limit from code, call workspace.getLimits with a root key that has unkey:v1:{workspace_id}:limits#read.
  2. Create the domain again.
Last modified on October 7, 2026