It should be supported to create prospects, customers, vendors etc. through PowerApp to D365 FO.
At this moment there is no logic in PowerApp for creating number series and when trying to connect the app to a D365FO number series, it does not update the number series correctly.
It would be a huge advantage if PowerApp can be used to create these records in D365FO. The users "on the road", like sellers, will get a simplified and easier user interface, that helps them create records on-the-go.