Once again, when I build my Xamarin iOS app and select a signing identity in the project properties, I get "no matching profiles found" in the "Provisioning Profiles" dropdown, I had this issue some time ago and posted it 
CodePudding user response：
Could you please check the version of the VS? This issue has been fixed in version 17.3, if your version is lower than this, please update it and try again. If your version is 17.3 or above. You could check if you have signed in the apple developer account by App Store Connect API key, because the Individual Account needs to configure the App Store Connect API key currently. You can go to App Store Connect, click User and Access, go to Keys tab, choose App Store Connect API, then generate an API key. After that, you can open VS and go to Tools-> Options-> Xamarin-> Apple Accounts -> Add-> Individual account, then enter your API key.
In addition, you could see the profiles in %HOME%\AppData\Local\Xamarin\iOS\Provisioning\Profiles
and the certificates in %HOME%\AppData\Local\Xamarin\iOS\Provisioning\Certificates
For more details, you can refer to the following docs: Creating API Keys for App Store Connect API | Apple Developer Documentation