There seems to be something a little odd going on. I agree that from what you have posted creating a temp table as a copy seems like complete overkill. Have you tried actually indicating that the insert is done by adding the semicolon to the end of the statement?
SELECT *
INTO #Announcements
FROM Announcements;
SELECT *
FROM Announcements A1
INNER JOIN #Announcements A2
ON A1.AnnouncementID = A2.AnnouncementID
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