Help Using XCode certificates to distribute app

I’ve developed a game that I now want to distribute on the Apple Store. I’m unable to get past the Signing and Certificates

I’ve developed on Windows. I have a Mac that I’ve borrowed. I’ve copied my iOS build to the Mac and opened it in XCode. I have an apple developer account. I’ve generated a certificate using Keychain Access. I also attempted to create a device certificate in my apple developer account.

When I try to use XCode Automatic Signing, I get two errors:
Your team has no devices from which to generate a provisioning profile. Connect a device to use or manually add device IDs in Certificates, Identifiers & Profiles. https://developer.apple.com/account/-

No profiles for ‘com.worddawg.worddawg’ were found
Xcode couldn’t find any iOS App Development
provisioning profiles matching ‘com.worddawg.worddawg’.

When I try to manually download a profile I get "No eligible profiles found for Unity-IPhone matching the iOS platform with bundle indentifier com.worddawg.worddawg
I verified that the identifier in my apple developer account is com.worddawg.worddawg

As to the error: “Your team has no devices from which to generate a provisioning profile” I tried to add a device in Apple Developer. I have an IPad but no IPhone. It says to get the UUID from ITunes. But ITunes is not available on IPad (interesting). It says to connect your IPad to your IPhone (which they assume everyone has but not me). There is some documentation that says to find the use the serial number found in IPad settings which is what I did. Not confident that is really what is needed as the UUID appears to be 20 digits and the serial number is 10. I also tried physically connecting my IPad to the Macbook but that didn’t do much good.

I’ve spent hours on this and seem to be getting nowhere. Seems that others have had the same questions but don’t see any solutions. If anyone can help I sure would appreciate it.