What is the problem?
I cannot get octoprint on the pi 4b to find the connection to ad5m with klipper
What did you already try to solve it?
Adding port under serial connection
Have you tried running in safe mode?
No. How?
Did running in safe mode solve the problem?
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Systeminfo Bundle
You can download this in OctoPrint's System Information dialog ... no bundle, no support!)
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Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
Rasp Pi 4b with octopi installed. Flashforge adventurer 5m with klipper installed