ArcGIS Pro NAD 83 to NAD 1983 Transformation Error after latest update to 2.8

Question

Has anyone else seen this Datum transformation error from NAD 83 to NAD 1983 since updating Pro to v. 2.8? There are no other choices in the dropdown box other than none and you can't get any information with the Details selection either? I suspect this may have something to do with having some Canadian data layers in my project but not sure. I can't seem to find a layer in my project that actually says it's using NAD 83 so I'm stumped.

FrankPanaro2 · Answer

I did actually find some layers in my base map template as NAD 83 and
redefined them as NAD 1983 but I wish they could have just let me add the
transformation in the Map Properties!

LindaWilliams1 · Answer

I received the same message in one of my projects after I upgraded to 2.8. All of the layers are in Southern California, and I received a Transformation Warning Notification for the one map in my project that has some layers projecting on the fly.

JayantaPoddar · Answer

If there is no existing layer with NAD 83, you don't have to worry about the warning. Maybe a layer was added and then removed from the Content.

If it still concerns you, create a new project > copy/paste the existing layers from the current project to the new project. You shouldn't be seeing the third transformation option there.