iCloud Mail not syncing between MacBook and iPhone after updates
I recently updated my MacBook Pro (16-inch, 2019) to Sequoia 15.3.1 and my iPhone 13 Pro to iOS 18.3.1. Since then changes I make to my iCloud mail on one of the devices are not reflected on the other device (ie, mail read and deleted on my iPhone, still shows as unread on my MacBook). I have tried turning off iCloud Mail in settings, restarting and enabling iCloud Mail to no avail.
[Re-Titled By Moderator]
MacBook Pro 16″, macOS 15.3