Unable to Identify Users with Flow User Permission in Salesforce Reports

The ability to identify users with the Flow User permission is not available in standard Salesforce reports. To retrieve this information, you must use the Developer Console to query the User object.
About the Flow User Permission: The Flow User permission is stored in the User object field called UserPermissionsInteractionUser. When this field is set to True on a User record, that user has the Flow User (also known as Interaction User) permission enabled in Salesforce.

Steps to Identify Users with Flow User Permission

1. Click the gear icon in the upper right corner of the Salesforce screen and select Developer Console.
2. Click File > Open Resource.
3. Enter "User.obj" in the search field and click Open.
4. Click Query Editor and enter the following SOQL query targeting the User object. Select the fields FirstName, LastName, Id, UserPermissionsInteractionUser, and IsActive. Filter by the condition WHERE UserPermissionsInteractionUser equals True. The full query is: SELECT FirstName, LastName, Id, UserPermissionsInteractionUser, IsActive FROM User WHERE UserPermissionsInteractionUser = True
5. Click Execute.
6. Verify that the list of users with Flow User permission is displayed in the rests below.

Users returned in the query results are those who have the Flow User permission enabled. The UserPermissionsInteractionUser field value will show as True for these users.