TOEFL tests are not overseen by Universität Hamburg, but organized through external test organizations such as: "studenttests". Thus, the IAA cannot answer any queries as to TOEFL procedure, etc. Due to Corona, exams have ended at the Amerikazentrum, as well, and will not be continued at a later date.
TOEFL Test Registration Code
The TOEFL Test Registration Code for Hamburg/ Amerikazentrum is: STN12254A