I just updated my testing device OS to iOS 26.5 and was trying to validate if our sdk is working fine or not and we found Call blocking is not at working for this update. I already seen some of the post regarding call blocking will not work if call to the expected block number is initiated from testing device. So just to clarify that is not the case in our findings.
Call Blocking using Call Directory Extension is Broken on iOS 26.5
Thanks for the post, I haven't seen any issue with the Call blocking in iOS 26.5. It's important to go over step by step on this documentation. https://developer.apple.com/documentation/IdentityLookup/getting-up-to-date-calling-and-blocking-information-for-your-app
Do you get the same results with just the relevant code in a small test project? If so, please share a link to your test project. That'll help us better understand what's going on. If you're not familiar with preparing a test project, take a look at Creating a test project.
Looking forward to see your focused project that reproduces the issue.
Albert Worldwide Developer Relations.