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I tried to create a Unified Sandbox environment several times by now, and failed spectacularly.
I selected "add Dataverse data storage", activated the option for Dynamics365 Apps and selected the Finance App - so far so good, but after about 1-2 hours of waiting time the environment simply vanishes like magic...
The user I used for trying is a Power Platform Admin (and Global Admin, just to be sure), it has the "Dynamics 365 Operations Application Partner Sandbox" license assigned to and I have also 100 GB+ free Dataverse capacity available in my tenant, so this shouldn't be an issue as well. So if anyone has any ideas what might be the issue here, I'd really appreciate the help :)