Unfortunately, you cannot combine GameStop Power Up Rewards accounts.
This is because each account is tied to a unique email address and is associated with a specific individual.
Here's why:
If you have multiple Power Up Rewards accounts, you can contact GameStop customer support to discuss potential options, but it's unlikely they will combine them.
Here are some things you can do instead:
Ultimately, it's best to maintain separate GameStop Power Up Rewards accounts for each individual.