The name provided is not a properly formed account name

Hi All,

I'm teaching myself some SSAS on my local laptop (e.g. not an AD environment - SQL Server and SSAS on same instance).

I've created a very simple cube with 1 dimension and 1 fact table that runs fine.

For the data source, I import data fine using a basic service account and use 'service account' as impersonation mode.

The important bit...I've added a role to the cube to automatically restrict the values available to the 'current user'  when they're browsing the cube dimension for the following two local user accounts I set up on my laptop:

MYPC\USER1

MYPC\USER2

using the following rule in the Dimension Data role tab:

{strtomember("[DIMENSION].[ID].&[" + MID(USERNAME(),INSTR(USERNAME(),"\")+1) + "]")}

The cube deploys fine with this role set up and I can browse it fine.

But...! When I browse the cube in BIDS/SSMS and select 'change user' to user either of the two users above I get the following message:

'The name provided is not a properly formed account name'

And I can't browse the cube.

Has anyone a solution?

Thanks,

ZP