When Otto died in 1549, the Amt of Harburg should have reverted to the dukes of Celle, but Otto's son, Otto the Second, succeeded in 1560 in having a new regulation added to the severance agreement of 1527.
Kui Otto aastal 1549 suri, pidi Amt Harburg minema tagasi Celle hertsogitele, kuid Otto pojal Otto II-l õnnestus aastal 1560 saavutada uus kokkulepe, mis lisati 1527. aasta loobumislepingule.