Shopware 6 cloud and Sendcloud: compatible or not?

I’m setting up a Shopware 6 Cloud shop and under „shipping“ I was able to make and integrate a Sendcloud-account. I’ve been hours trying but the only thing which works is that orders are transferred to Sendcloud but the integration doesn’t work well (cannot select carriers in de checkout etc. etc…). In the Shopware-store it says that it’s only compatible with Shopware 6 (not cloud). But why I’m I able then to connect it in the admin. Anyone?