I think that I found a bug using the service EventBridge Scheduler. When I create a new scheduler and select a FIFO queue as a destination, the only parameter that I can set is the Message group ID. My queue does not use deduplication based on the body message, therefore I need to set the message deduplication ID. This parameter isn't available in the AWS console and SDK (software.amazon.awssdk scheduler - java) parameters. Consequently, it just works if my fifo queue uses message deduplication based on the body message.