After dropping an A-record TTL to 60 secs (it was previously no higher than 600 secs for several weeks) and making an IP change for a small business website on Monday, I took down the old web service just over 24 hours later on Tuesday evening. We then had reports of some customers not being able to access the website on Wednesday morning. On investigation using my iPhone it would appear that Apple Private Relay is still directing clients to the old IP address.
It's just as well I have iCloud+ as I would never have seen this issue otherwise and would have been none the wiser as to why some customers were having problems.
Has anyone else seen this and/or have a fix other than waiting longer? Do you know how long it takes for Apple Private Relay to update? This isn't expected behaviour of DNS?
I spoke to someone at Apple yesterday and there wasn't much they can do. I hope they're escalating internally as almost 3 days later it's still pointing users to the old IP address despite having ample time for proper DNS propagation.