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SOLVED... This was a problem with the power supplies that operate each unit. When the computer was unplugged the V+ rail dropped on one unit and while the Teensy still continued to run, the data output pin was not reaching a proper 'high' signal level that could be read by the second Teensy.

I have a project where a Teensy 4.1 reads 640 inputs from a pipe organ console, encodes the info to midi and sends that midi out two ports. The fist port on serial 2 goes to the pipes and their decoder. The second port on serial 7 sends midi to console controls when stop changes are triggered. (...