Multicurrency not working with Standard Tax Rate

I installed Multicurrency (Currency Switcher) and have the Country switcher widget set to use IP address or selection. Am also using Multicurrency Product Base Price as most of my products are sourced in CHF. My nominal country is Australia and the only other country is NZ. The currency switcher widget works fine so far via an IP test from NZ and the widget here in Aus.

In WooC Setting>Tax>Standard rate, Australia is specified as 10% and NZ is specified as Export rate of zero. In WooC Settings>Tax>Zero Rate, NZ is set. However, in the Cart & Checkout, the module is always assigning the Australian tax rate when the currency is set to NZ.

I have pored through WooC and Booster documentation and cannot find any reason why this should be so. However, I do note that I am wondering if Multicurrency switcher sets the country code that WooC ereleis upon for determining which country tax to apply? (I had tried Products & Currencies by Country but that didn’t work for my situation).