Final update on the issue for now: After 5 days of troubleshooting, Framework Support finally admitted that there is a known issue connecting iPhone 15s to Framework 16 laptops and that they are actively working on a solution. They do not have an exact date on a fix yet. Any further issues will be communicated via the Framework Community Forums. They also recommended not plugging in the iPhone 15 to the Framework to avoid any further issues. My opinion: It is not a great customer service experience to get a “this is a known issue - please stand by and don’t use it for now” response after 5 days of intensive research and troubleshooting.