Your domain name has been reclaimed
The domain name you had has been reclaimed by another organisation, and the domain part (to the right of the @) in some of your user accounts has automatically been changed. For example, if you had an account with the user name eblock@townshipschools.org, that user name was changed to eblock@townshipschoolsorg1.appleid.com. Users who had their username changed still have access to all of their content.
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