Without the specific login and details of your account, we will not be able to give a full answer. Testing on this side on a basic setup shows that the CA tax works.
I see that you did contact support and they determined it was a compatibility issue with a plugin. Please contact support again if you need any further testing within your account after contacting the plugin developer for a fix.
I hope this answers your question. If you have any more questions or information specific to the issue please leave a comment below so we can further assist you.
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