Getting the available Record Types in the org versus the Record Types a User is allowed might be different. To help this in Flow, a new Apex Action, Get Available Record Types, was added in the Winter ’21 release. This Apex Action will get the available Record Types that the User has access to, including the default record type, to help ensure your User is creating Records using Record Types they are allowed to use, with ease. Additionally, there is a Lightning Component, Record Type Picklist, that will allow you to easily show the Record Types to User and use the selected Record Type later in the Flow.
First, take a look at the Apex Action, Get Available Record Types. In the example below, we are looking up the available Account Record Types for the User. To do this, you first enter the Object API Name, in this instance, Account. You will need to click the box, Manually assign variables (advanced) so that you can set your variables appropriately. Then, you need to have a text Variable to store the default Record Type Id for the User. Finally, you need to have a collection Variable, type of Object, where the Object is Record Type, to store the full list of Record Types available for the User. See second screenshot for an example.