I also have assumed, but I was wrong. They impose a limitation. There is a rather intransparent parameter they call “diversification” that can’t be below 5.0. It is shown in the demo portfolio, but it’s role is not explained. Allocations with “diversification” below 5 will not be accepted. That means, for stocks-only portfolio, you have to add some US stocks, otherwise you just can’t have enough diversification.
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