There is a sermon in nahjul balagha related to the death of Prophet where Imam said "After you the nabuwat came to an end, The orders of God are completed and no more divine message will come" so a scholar has raised a question on Imamat through this line?

But we believe this that Hazrat Jibraeel used to come after the Prophet to Hazrat Fatima and other Imam so please guide in this regard

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The prophethood did come to an end. The job of the imam
Is not to receive divine message but to interpret the message of the prophet and the Quran. There is no issue against Imamate with this.

Yes angels comes to lady fatima doesn’t mean the revelation of the Quran is still coming down. The angels used to speak to maryam too, and she is not a prophet.