You need a PostgreSQL service enabled in order to provide the database for your Mendix application. This is where any perisistable data is stored. With some apps that is a lot of data, and in others that leverage a lot of non-persistent data from SAP or other third-parties, it may only be User records and a few settings. Either way, you need a database.
As for the provisioning process being stuck, that of course is not supposed to happen. I think your best bet is to submit a ticket with Mendix support.
HI!
Did you solve the problem?
I got the same error and I don’t know How to solve it.