Yes, initially I thought that was the issue - bucause I save a DIN-AP3 as a DIN-AP4.
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So redid it from scratch and it still was not working.
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I THINK (not confirmed because it "just started working after reboot") that it was because I completed the incomplete bacnet objects with ctrl+I
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When I did that it just entered 0d as the object number for 100+ objects
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I commented them all out, and I suspect that is what might have been the issue.