May's office dismissed the document, which was published on Tuesday by the BBC, and said the poor spelling and childish language indicated it did not represent government thinking, though a spokesperson did not explicitly deny the document was genuine.
Less than five months before the UK is due to leave the EU on March 29, a deal is nearly done, but officials have repeatedly cautioned they are still haggling over the Irish border issue.
According to the communications memorandum, headed “Brexit Communications Grid Summary”, May's cabinet was to review the deal on November 6, with Brexit Secretary Dominic Raab announcing decisive progress today.
After a deal was clinched, leaders such as Japan's prime minister would tweet in support. Irish Prime Minister Leo Varadkar's name was spelt incorrectly.