iTunes Store fills in obsolete AppleID
A while ago, I changed my AppleID from a 3rd party email to an iCloud.com address. I had to change it in numerous places, but seem to have gotten through that -- with one exception.
When I go to iTunes, then Store, and scroll down to Account and open, the old AppleID is auto-filled. When I overfill in the correct address, all seems to be OK. It is therefore merely a nuisance, but I even tried "forgot my AppleID" and went through the pwd change; still autofills wrong.
Is there a fix?
Thanks.
iMac late 2009, OS 10.13.6, iTunes 12.8.3.1
iMac, macOS 10.13