I opened a support ticket and was told "This is already a known issue. Our Product team has prioritized this issue and plan to make the fix available in the December Patch release."
Best answer by kevin_ly
One thing to make sure when adding Account ID in a DataSpace to make it useful for Copilot is it needs to look like this when added. ( Primary Account Reference)
This is how you would add it, by clicking to whats similar to screenshot below.