bleepingcomputer[.]com/news/security/cloudz-malware-abuses-microsoft-phone-link-to-steal-sms-and-otps/
Windows Phone Link can access your phone to do everything from make calls and send texts to copying pictures you've taken, and as shown with the CloudZ malware, that also means stuff like sensitive messages, texts, & one time passwords. That's another potential weakness to think about before you use Phone Link.