I just now started having the exact same issue. The build runs fine on a physical device and simulator, but I cannot archive it to send to TestFlight.

Never mind, it uploaded after about 30 minutes. I wasn't sure if there should be a delay or not.

Thank you for your reply, and sorry for the confusion. I am still learning what exactly all of the IDs and Certs are. My question revolves specifically around 'Identifiers' in the Certificates, Identifiers, and Profiles section of the developer account (see image). Is it okay to delete these and re-add them, even if you want to the exact same information (ie Bundle ID) and capabilities in them? From reading around in the forums, it appears that once the Bundle ID is used in a Certificate, it cannot be used again in a new one, even if that specific Certificate is Removed/Deleted. I hope that helps clarify my question.