For the api - https://www.mongodb.com/docs/ops-manager/current/reference/api/backup/update-one-snapshot-schedule-by-cluster-id/ we have an ask to use 4 in snapshotIntervalHours. Right now its not supported. Supported ones are - 6, 8, 12, or 24.

Please check and let us know if its possible to add 4 as well to the snapshotIntervalHours