Ulrich von Passau Burggraf von Passau 9HFS-58G can't be sealed to his parents.
Please look into this.
He is a relative.
You will meed to first clear up the problems on his person page. After fixing those if the Sealing to Parents is still unavailable it could be investigated further.
Birth before Mother Could Have Children - The child's birth year is listed as occurring before the mother was at least 12.
Possible Duplicate - Ulrich von PASSAU • G6TY-7K6
Possible Duplicate - Ulrich Rapotonen • G6T4-1J1
Ulrich von Passau Burggraf von Passau 9HFS-58G: The sealing to parents is now available to reserve in Family Tree.