Currently, {{{reward_name}}} tag does not display redeemable names while sending out test emails from the campaign as no reward is being gifted with the test emails. Since the tag does not have a value to fetch, no reward name will be displayed in the email.
In such cases, you can activate the test campaign with a segment (which contains only your test accounts), once the campaign is processed and the reward tag will fetch the name of the redeemable in the email sent.
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