When you can't get the dough to come together, it's never caused by putting the oil in afterward.

First, check whether the middle leaf of the bread machine rotates normally

Second, look at the ratio of your flour and moisture (egg, milk, etc.), if the moisture is too little, naturally it can not be kneaded in

Third, if you put the oil in afterward, you have to help your friend of the bread machine, because the dough is good and then put the oil in, in the box and the dough is slippery. You can separate the dough into several pieces or press a few pits to release the oil.

Fourth, you can also consider putting the oil first, use the rise function, stop after 20 minutes, and then start the bread program. This will solve the problem of not kneading the dough enough, and no more slipping because of the oil being put in afterward.