Hello Heir, We've confirmed the issue related to the Amazon Prime banner. We ask that players who were unable to claim the 11th reward please contact the Epic Seven Customer Service team after claiming the 12th reward on 7/15 (Thu).
I have been asking Epic Seven Customer Service for a week now and I have yet to have my issue resolved. It has been back and forth yet my rewards have not been able to be claimed. I even sent a screenshot I have Amazon Prime active, yet has not been resolved.