@MissToi You won't receive any prompts to watch an ad on your Roku device as this is a T-Mobile specific offer.
To clarify, you will need to redeem the promotion on your phone first. As long as. you are signed into the same account on your Roku device after you redeem the promotion from your phone, it should automatically transfer over.
Let me know if you continue to run into issues with this after first enabling the promotion from your phone.
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