Hello  @rsardenberg  Welcome to the Canvas Community.  Thanks for posting your message.  Let's have you try these steps:

[NOTE: This is the process for creating a single copy of a quiz. Do not repeat the process, as any subsequent imports will overwrite an existing quiz.]

1. Log in to your Canvas course.
2. Click on the "Settings" menu in your course.
3. Click on the "Import Course Content" button on the right side of your screen.
4. Under the "Import Content" heading, use the "Content Type" dropdown list to select "Copy a Canvas Course".
5. Next, select the same course that you are logged into right now.  (You'll probably see a warning message that you're choosing the same course, but that's okay.)
6. Choose the option for "Select specific content".
7. Click the "Import" button.
8. Under the "Current Jobs" heading, you will see a new line with today's date and time along with a "Select Content" button.  Click that button.
9. You should see a row for "Quizzes" with an arrow to the left of it.  Click that arrow to expand the list of quizzes in your course.
10. Place a checkmark next to the name of the quiz that you want to make a copy of.
11. Click the "Select Content" button.

Once the progress bar completes, you can go to your "Quizzes" page in your course, and you should see a duplicate of the quiz.  You should be able to re-name that quiz and make any changes to it that you need.

I hope this helps!