I was having trouble putting my app on my iPhone, so I decided to remove all certificates, delete and reinstall Xcode, and re-create certificate, identifier, and profile on Apple Developer. I have macOS Catalina and I have an iPhone 6S.
I currently have Xcode 10.1 installed. These are the steps I followed.
I currently have Xcode 10.1 installed. These are the steps I followed.
I requested a certificate authority through certificate assistant.
On the Apple Developer website, I created a certificate, uploaded the certificate request, and downloaded the certificate.
Opened the certificate in KeyChain Access.
Created Identifier and Profile on Apple Developer website
Opened mobile provision file in Xcode