“Then the seventh angel blew his trumpet, and there were loud voices in heaven saying: “The kingdom of the world has become the kingdom of our Lord and of his Christ, and he will reign for ever and ever.”” (Rev 11:15 NET)
[Greg] Beale has at least two difficulties with Revelation 11:15: (1) At one point he says the verse looks forward to a change of rulership over the world, but in the next two verses he contradicts himself by changing the kingdom’s domain from this world to the new heavens and the new earth in the eternal state. (2) His second difficulty which he admits, is in understanding how Christ could at the time of the consummation deliver up the kingdom to the Father as 1 Corinthians 15 requires, since Christ will only be starting his rule over the kingdoms of this world at that time (Robert L. Thomas, Perspectives on Israel and the Church: 4 Views, 131).
The only conclusion that make sense of this passage is a premillennial framework, recognizing that Revelation 11:15 portrays the future temporal phase of the kingdom; i.e. the millennial phase before the eternal phase. But since amillennialism is committed to a skewed interpretive framework, we witness their contradictory conclusions on passages such as this one.