@slimboyfat
I appreciate that you saw a possible fulfillment of this prophecy about "the removal of the constant feature"
But I think that the 1290 days begins when all the 4 events has happened:
Daniel 11:31 and arms will stand up, proceeding from him;
1: and they will profane the sanctuary,
2: profane the fortress,
3: and remove the constant feature.
4: And they will put in place the disgusting thing that causes desolation.
Even though the order is mentioned in this sequence, it does not require that the events happen exactly in this order, because there are other scriptures that are examples of that. The first example that comes to my mind is Genesis 3:15:
So, I have concluded that the 1290 days begins when the "disgusting thing" has been put in place in the "sanctuary" and "fortress" in order to profane it.
The sanctuary and fortress in Daniel 11:31 I understand refers to Jehovah's witnesses headquarters. That is the modern day Temple similarly as was the Temple in Jerusalem in the first century.
And similarly as in the first century, the Roman idol standards profaned the Temple in Jerusalem, so will a "image of the beast" be created and placed in the WT headquerter compound among all other places because the whole world will be forced to worship it. So the "disgusting thing" is not the UN as taught by WT. But a thing that will represent a coming worldwide authority, the sevenheaded beast of Revelation 13.
So when the image of the beast/disgusting thing is placed in the WT compound, "fortress", then the 1290 day countdown will start.
But you could very well be right that at the end of 1290 days the UN gets the power and authority over the earth. And I can not rule out that at the 1335th day Babylon the Great will be taken down.
You made a clever remark that this lockdown event should figure in some way in the endtime prophecy, especially because the preaching work and meetings in person have been removed.