Hi Rene, CNAME propagation delays or partial replication can happen for a few reasons. First, verify that the non-working records aren’t conflicting with existing A or TXT records for the same subdomains, as that can block proper resolution. Next, confirm that Netlify’s target hostnames are correctly formatted and active — sometimes a misconfigured target endpoint can cause DNS lookup errors. Also, clear your DNS cache or test using external tools like dig, nslookup, or dnschecker.org to see if the issue is global or local. If replication remains inconsistent after 48 hours, it’s worth opening a support ticket with IBM NS1, as there could be a zone synchronization issue on their end.