This API is supported from moengage_flutter version 6.1.0 and is only available for the Android platform and it will throw UnImplementedError error in other platforms
Delete User From MoEngage Server
Delete the current user from the MoEngage server using the deleteUser() method in the Flutter SDK.
To delete the current user from the MoEngage server use the deleteUser() method as shown below, where you will get an instance of UserDeletionData.