The line tool doesn’t work between those points either.
It reports that the edge is on a hidden layer ‘Topo lines’.
You are using Layers/Tags incorrectly.
ALWAYS draw geometry with the default tag ‘pencil’ left at Untagged (or Layer0 in older versions.)
Only assign tags to groups or components, or to non-geometric objects like Dimensions or Text.
Set the pencil icon in the Tags panel to Untagged, and LEAVE IT THERE! ALL THE TIME (with very few and rare exceptions).
Your model’s Tag window shows you drawing new geometry on Elevations 2.
Before you go much further, turn on hidden geometry and hidden objects (in the View menu). Select each object (group or component) in turn, and open it for editing. Select all (of the geometry inside it) and change the Tag assigned to Untagged. Tag the object, not the geometry inside it.
You have assigned tags to raw geometry. For example, many of the vertical lines visible in your model, and in the video, have a wide range of tags - Elevations 2, Elevations-interpolated, and numerous others. Select all geometry that is on any one tag, and make it into a group or component, then assign the tag to that, and reset the geometry inside it to Untagged. Alternatively, turn off all tags except one, then make a group or component of what is left showing. Then do as before - open the object for editing, select all inside it, then assign the tag Untagged to it all.
Repeat for each tag in turn, until you have no loose geometry in your model, for any longer than it takes to draw it and make it into a group or component.