Line Thickness in 2D not showing up in exported SVG file.

Hi everyone, i have tried all settings in Creo illustrator standard (12.1) and have changed my line thickness for 2D and it still no luck in seeing two different line thickness when opened in Adobe illustrator.

Below is what i have done.

1. Render mode set to HLR
2. Change pen settings - In File/Options/illustration/Pens/Thick/edit - changed 0.35 - Apply
3. Change pen settings - In File/Options/illustration/Pens/Thin/edit - changed 0.25 - Apply
4. Export to svg - File/Save Figure as/Save as illustration file/File name - Tick Thick/Thin lines - Tick Polylines - Tick Fixed Size - Include hotspots for callouts - Tick Combine hot spots for same item. then click “OK”
5. Open file in Adobe illustrator and all lines are the same thickness, so no difference in line thickness

NOTE: Only other change is my 3D page size to W170mm x H242mm

            When viewing in Creo Illustrator HLR i do not see line thickness difference either, not sure if you are supposed to.

Thanks for any help

Kind regards Gareth