Good morning, @JusFed ...
I think you'll need to reach out to your school's local Canvas administrator on this one. It sounds like this would be a permission setting that your Canvas admin would be able to tell you more about. Specifically, there is a permission at the course level called "Discussions - post", and this may be turned off at your school for the "TA" role. But, your Canvas admin would be able to tell you for sure if this was the case. What user roles and permissions are available in Canvas?
I hope this will help a bit. Sing out if you have any other questions about this...thanks! Take care, stay safe, and be well.
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