Could you elaborate on what steps you took to set up sharing consent between subdomains? Are both tracked with the same tracking code? Did you specify the domain/subdomain in the privacy settings? (In the administration panel)
Here you can find more information about these settings (point 7):
I see the issue, thanks for the screenshots! As you can see in the description - “Each value you type in will create a bucket of shared consents”. So, in your case, entering *.ihu-reconnect.org should fix the issue.