I received a notification that during the submission process there are changes needed. There is no additional information except a link to the test result page, where all (technical) test cases are marked as "passed". There are no tests visible under the sections "Malware Review Test Results" and "Additional Validation Test Results". As I assumed the page may be broken somehow I tried it in different browsers and language settings -> no difference.
Where can I find further information on what I have to change?