Why is the checkout error occurring when selecting CDN currency?

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Good day. We use the Pipeline theme (5.0.2) and have enabled dual currency (USD (default) and CND). A customer told me yesterday that she was previously able to to checkout with CDN selected to checkout... but now receives "There was a problem with our checkout". I was able to duplicate this error using the same. When we (both of us) change currency to USD... the errors does not appear (i.e., successful). All this said... other customers continue to successfully submit orders with CDN selected.

Glad/hope to hear comments... Thanks!

Dean