If an ATU tune finishes like that, with --, then it did not find a match! (and will be in a random state).
You don't have enough power for a successful Tune.
Try running the TX gain calibration with the K3 Utility.

Or, with a dummy load, ATU in BYP, make sure TUN PWR is at "nor", then set pwr to 5.0 watts exactly and long press XMIT to send a carrier for several seconds. (That will do a manual tx gain cal on that freq).

Then engage ATU and do an ATU TUNE and it should find a match.
If the TX gain cal fails, something is wrong with the LPA.
Keith WE6R Elecraft Tech.
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