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Article 13. Every State shall abide by the determination of the United States in Congress assembled, on all questions which by this confederation are submitted to them. And the Articles of this Confederation shall be inviolably observed by every State, and the Union shall be perpetual; nor shall any alteration at any time hereafter be made in any of them; unless such alteration be agreed to in a Congress of the United States, and be afterwards confirmed by the legislatures of every State.

Well, the approval for a convention to consider all matters necessary to improve the federal government was agreed to by Congress in February 1787 so that complied with the Articles. As to the discussions over the process that replaced the Articles with the Constitution, I'll be the first to admit that I need to do some more reading up on that. You might want to do the same since you seem to be guessing here as well.

It's no matter of guess to read the plainly stated texts of both documents, non-seq. Even if the convention was approved by congress unanimously, the document it produced was not and did not even have the participation of all 13 states in its creation. The unavoidable answer is that the Constitution replaced and supplanted the supposedly "perpetual" Articles, meaning they weren't so perpetual after all.