Kerning Groups Question

I added left sidebearing of d, e, o and other round characters in the same kerning group “o”. But whenever I export the font, I lose the kerning for characters that are lowercase o. Since they have the same shape in my design, it would be great and would really help if it worked, anything I’m doing wrong? When I added d and d with accents to a d kerning group, it exported fine.

Make sure your kerning locks are set.
Take a look at this: