I tried it today. WooCommerce is already using 3.1 version, as like you wrote, pelago 4.0 is changing the internal API, according to docu.
So I updated Xenforo’s Pelago installation from 2.1.1 to 3.1 and now everything works fine.
I will send this XPress support as well, perhaps thy will fix it.
Perhaps it would be good, if you also update this to XPress support.
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This reply was modified 5 years, 11 months ago by archangelsk1981. Reason: typo
Oh, this sounds promising. I will try it. Have you tried only updating one installation?