I only ever had one AppleID and it was the first time I seen this so it was very strange to me.That happens with me often. I have two IDs since one is from iTunes days and the other iCloud. I wish I could combine but that that is another story and will never happen. You did the thing I was going to suggest, search your order on the page and tell it to add it to your login. It’s just this way at times.
I still see my order. I originally placed the order with the trail band with a date in November. Realized I could get the watch sooner with the Alpine, I canceled and ordered again. I did the same with my wife’s phone. We had her setup for the plus but after thinking about it, I ordered the Pro Max. She would have asked why I could do certain things she could not and for the price difference I didn’t want that question for the next two years.
Point is, not sure the orders were canceled for any of the reasons where I did the same and no issues. I hope they make it right for you guys that were canceled or at least provide a good reason for it that makes sense.
That was probably why the Apple Support chat was able to see the order and assure me it was still good. Just searched for it when I gave them the order number lol. Their software probably just missed a step when it was processing the order.