Many people have recently had trouble logging into the Starbucks app. Deleting the Starbucks app and then reinstalling it has been known to solve the login problem.
Note: If you tried multiple incorrect passwords to access the app, you may be locked out. According to Starbucks customer service, there is a 24-hour lockout period although the app will not give you any indication you’re locked out. However, reinstalling the app is the best way to ensure best results.
If you’re on a smartphone and login to the Starbucks website, it’s possible to use the mobile version of the website to make purchases using your Starbucks card. It’s also a way to confirm that your username and password are working correctly.
If this works for you, or doesn’t, feel free to post your experience in the comments below.