It looks like the answer object has an issue:  the name of the answer is "answer_text" not "text".

Instead of using "quiz_questions":[{"answer":1108,"id":"6"}] try "quiz_questions[][id]":6,"quiz_questions[][answer]":1108 I've been successful with ...

If you want to know whether or not to offer to start or resume a quiz, you can use the workflow_state of the quizSubmission object.  I believe there can only be one "active" (not "complete...

I believe you need to create a Quiz Submission, then the questions are available as Quiz Submission Questions.

Using the "id" of the quiz submission object did the trick.  In looking at the JSON returned from quiz submissions - {"quiz_id":216962,"id":1144880,"submission_id":8605...

Instead of using "quiz_questions":[{"answer":1108,"id":"6"}] try "quiz_questions[][id]":6,"quiz_questions[][answer]":1108 I've been successful with ...

If you want to know whether or not to offer to start or resume a quiz, you can use the workflow_state of the quizSubmission object.  I believe there can only be one "active" (not "complete...

I believe you need to create a Quiz Submission, then the questions are available as Quiz Submission Questions.

I believe the endpoint Get Quiz Submission (in the Quiz Submissions API) is what you're looking for... https://canvas.instructure.com/doc/api/quiz_submissions.html#method.quizzes/quiz_submissions_...

Just a wild guess, but the id of the answer has a decimal point. This seems inappropriate.