Not gonna lie, when I first read this I was a bit but after reading it again, I think I know how to fix it haha. What you will want to do is follow these steps to ensure the line is set up as DIGITS you can use for that specific account. Let me know if you are still seeing this weirdness after you have set that line up as "DIGITS I can use" for the new account.
That worked, thanks so much.
Just as a side note, one could view it as a security concern that as a line is moved over, it's still tied to the original account from a DIGITS perspective. In this case, since I owned both accts it was a non-issue.