@Clive_A That worked! For some reason I wasn't getting email notifications, so it took me longer to see this. Thank you! I appreciate you looking into this so quickly.

@Clive_A Attached zip with snips of each switch config and the actual .cfg file. For these snips, the 2nd cable connecting switch B and C is disconnected, because it won't work if both of them are...

I am trying to LAG 3 switches together. The setup I have is one switch: A. TL-SG108PE 5.0 Firmware (1.0.0 Build 20220531 Rel.35386) downstairs with LAG2 on ports 5 and 7 going upstairs to switch: B....