It appears that H5P questionnaire attempts are not recorded. I am not sure if questionnaire h5p type is one of the types described here in the Attempts Option setting of the module:

Some H5P provide attempt tracking data for advanced reporting such as number of attempts, responses and grades. Note: Some H5P don't provide attempt tracking data. In such cases, the following settings will have no effect.

STEPS TO REPLICATE:

1. Create a course and enrol students.
2. Turn edit mode to On.
3. Add an H5P activity.
Attempt Options
Enable attempt tracking  = yes
Grading method = Highest grade
4. Create a new H5P questionnaire or just use the attached file.
5. Log in as a student user and attempt the H5P questionnaire activity and submit.
6. Back as admin, go to the H5P activity and click "Attempts report" tab.
RESULT: The columns Date | Score | Attempts are empty and no records.