I didn't notice this before now but MinhT1 addresses in his previous post, our Transferwise account is a borderless account which is regulated by the Financial Conduct Authority (FCA) in the UK, and as such is considered as a foreign account for US residents and citizens.
Armed with this knowledge, I would say that both USD and Euros are regulated by the FCA and you would list the UK as the foreign country to report on the FBAR for both the USD and Euro balances.
When you list this on the FBAR, mention this is a Transferwise account. I am sure FBAR is well-aware of Transferwise.
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