Intel 9560 nic

Router is AC-86U.
New Lenovo laptop has Intel 9560 adapter, on W10 Pro, with latest Intel drivers (and standard settings).

Cannot connect in 5GHz network, for the life of me; only 2.4GHz.
While trying to connect to 5GHz, Asus UI reports for short time "wired" connection (???). And after a while connection fails.

Any insight on this?