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MSNBC’s big “Trump tax return” scoop has caused friction between the cable news network and parent NBC, according to insiders.

“[MSNBC] announced it on Twitter, and [NBC] found out when [the general public] did,” said a source.

“[MSNBC president] Phil Griffin was trying to undermine [NBC News president] Noah Oppenheim. There was never a conversation. They overplayed their hand in a huge way.”

Host Rachel Maddow teased the story on Twitter, then withheld the story till later in her program, revealing in a big ­anticlimax that Trump paid $38 million in taxes in 2005. “It’s their cable network, but it’s still NBC News. [NBC] did not appreciate being kept in the dark … To hype such a big story and not really deliver is a bit embarrassing. Airing a story you’ve hyped 20 minutes into your broadcast makes it a lot less of a ‘breaking news’ story.”

A rep for NBC insisted there’s no tension between the execs. “They’ve been friends for 20 years — ever since Phil hired Noah straight out of college to work on ‘Hardball.’ They’re supertight.”