How to assign a specific color profile to an image?

I am in the process of submitting an image electronically.

They want me to submit images that have the color profile "ISO Coated v2 ECI".

My image has the color profile "Adobe RGB (1998)", according to File Info, and according to Preview.

I have downloaded the color profile from eci.org and put them in /Library/Color Sync/Profiles.

When I open the image in ColorSync Utility, I can see the profile under 'Profiles'.

However, when I try to assign or match or apply the profile to the image in ColorSync, it does not "stick".

With 'Match to Profile', I can select the profile (in the dropdown menu under 'Output'). But when I then save the image (using Save, Save As.., or Export..) it seems like it does not put that profile in the image, i.e., when I open the new image using Preview, I still get the "Adobe RGB (1998)" profile.

Same with 'Apply Profile'.

With "Assign profile", the profile I want is greyed out.

I also tried Pixelmator, but that does not offer me the profile "ISO Coated v2 ECI".

Am I missing something?

Could some kind soul please shed some light on this?

Or point me to the right web page or forum?

All insights and suggestions will be highly appreciated.

Best regards,

Gabriel.