How do I turn on 2FA for a dev account that is not an email address?

I have lost the ability to get my apps onto my iphone, or to build to my Mac.
I Xcode it for my app on the General | Signing, it says:

"Unable to log in with account "logistes".

"Sign in to try again."
I click the sign in button and enter my password, and the situation stays the same.
Below that is says:
"Xcode couldn't find any iOS App Development provisioning profiles matching ..."
This seems to be happening because I have one apple ID for the phone, one based on an email address, but the older apple ID, which I have been using for about 10 years, is just a simple username.
Can someone please get me out of this quandry?
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Mark

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logistes
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I suggest you change your old Apple ID to be in the form of an e-mail address. That is pretty much the only thing that Apple will allow you to with those old Apple IDs. I have one too and I'm going to keep it until the last possible second. But for my developer work, I always play by the rules. I have a separate, e-mail Apple ID for that.

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john daniel
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Speaking of 2FA, it's REALLY dumb. I logged into AppStoreConnect from a different location using the same MacBook that I always use. It prompted for the 2FA PIN again, which was bad enough, but it sent the PIN TO the MacBook I was using! What good is it if it sends the PIN to the device that is trying to log in???

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chuckc192000
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It is not designed to protect the device. It is designed to protect your account. If someone steals your device, then you will need to remove that device from your list. Two-factor authentication is designed to protect your Apple ID and all associated services (such as iCloud and your developer account) from people who are hacking from their own devices.

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john daniel
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