In your exportStatus query, the exportId argument should be "exports/2021-12-02/0x26d673b-1006229647":
query ExportStatus {
exportStatus(
exportId: "exports/2021-12-02/0x26d673b-1006229647",
taskId: "0x1bd686d8f"
) {
kind
lastUpdated
signedUrls
status
}
}