Why did I not get my Bonus Stars?
If you don’t think you got your Bonus Stars, please check your History online or in the app. If you were part of a Star Challenge [like a Star Dash] or entered a Star Code, your Bonus Stars should show up as a separate entry there. If you got Bonus Stars for a purchase, check the transaction detail—the promotion may not be called out, but did you get more than two  Stars/$1 for your purchase? For example, in the following transaction, Double Stars were earned.
If you still think you have not received Bonus Stars from an offer, please check the following:
Did you receive an email with an offer directly from Starbucks?
Starbucks Rewards™ offers are personalized just for you. If you didn’t receive an email directly from Starbucks you likely were not eligible to participate to earn the Bonus Stars. If you are a Starbucks Rewards™ member you will receive your own personalized offers just for you from us by email or in your Starbucks® Mobile app.
Have you checked your email offer for the Star award date?
Please check the email you received to find the date the Stars were to be awarded to your account. For many offers the Stars will appear in your account within 24 hours. However, there are some offers where the Stars are not awarded until a later date. In addition, some offers will have a final step where you will receive an email with a Star Code that you have to enter into your account to redeem the Stars. Also, remember to check your email and spam filters to make sure you are receiving all of your emails from Starbucks.
Did the email instruct you to “opt in” to participate?
Please refer to the email offer you received. If there was a “Join Now” or “Activate Offer” link or button in your original email and you didn’t opt in by clicking on it, then you were not recognized as a participant in the offer and no Bonus Stars would have been awarded.
Did you meet the purchase qualifications for the offer?
Please check your History online or in the app to make sure the timing qualified you for the offer. For example, an offer might have been for a purchase made after 2 p.m.
Note that for offers where you need to earn multiple Stars to qualify for Bonus Stars, only Stars earned from a purchase at a participating store will count towards the offer. Bonus Stars earned from other offers or surveys do not qualify.