Hello @Roanne,
Thanks for your reply.
The Coupons tab will only be available by default if you are using our Shopify, Magento 1, or Magento 2 integrations, and if you've just added your integration and it has not synced yet the tab may take some time to appear.
Additionally, depending on your integration, you may need to toggle on uploaded coupons in order to view the Coupons tab in your Klaviyo dashboard.
To find this setting, navigate to Account > Settings > Profile Maintenance. Toggle on the Uploaded Coupons option.

Once you enable uploaded coupons, you will see a corresponding tab in Coupons.