Step 1 - I checked my profile stuff, and that I was logged into my Apple account from Visual Studio -> Preferences -> Accounts
Step 2 - let Visual Studio do the signing for me enabling the “Automatic Provisioning” that you can find & setup via left-click Info.Plist -> Application tab
Step 3 - To make sure my keychain login chain wasn’t locked, I ran the following in my Terminal:
$ security unlock-keychain login.keychain
(followed by entering my computer password in the dialogue that appears)
Step 4 - I restarted my MacBook Pro
Step 5 - After restart, I removed the USB cable from my phone to my MacBook, and re-inserted it
Step 6 - I cleaned my entire solution
Step 7 - Then I ran the project to build and compile it for my device