There are five possible reasons why this may be happening:
You’ve already scheduled 2 donations in a rolling 7-day period.
You’ve already scheduled the maximum number of allowable donations in your 30-day cycle. We outline this here.
You’re attempting to book a donation outside of your 30-day cycle. You’ll need to wait until your new cycle begins in order to schedule a donation within that time frame.
You’re trying to schedule a consecutive donation. You’ll need to allow for 1 day between donations because
You’re currently deferred. A deferral is a temporary safety measure that may prevent you from donating for a day or sometimes longer, depending on the type of deferral.