If guests are receiving a reward that expires on the same day, it is because of how the anniversary campaign is configured. On step 2, you are able to configure Lifespan Duration Function. If you set this to Reference Date Only, you are saying that this reward must be redeemed on the exact anniversary (reference) date. Then, the anniversary date for this will be controlled by the Reference Date on Guest.
In the example below, we are specifying the Reference Date on Guest as the date the guest signed up and the Lifespan Duration Function as making the reward valid only on the date of reference.
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