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 been automatically changed. For example, if you had an account with the user name eblock@townshipschools.org, that username was changed to eblock@townshipschoolsorg1.appleid.com. Users who had their username changed still have access to all their content.
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