The 6Dii is probably not compatible with that setup, you should use the camera controls. Canon answered a similar question here:
Set the sender to radio-based Wireless E-TTL. Press the button on the sender unit to set the sender to E-TTL. 4. Set the Ratio to “ALL” — On sender unit, press Fn Button 4 (under “Menu 1” icon) until Menu 2 appears. Press Fn Button 2 (under “Ratio” icon) until “ALL” appears on sender unit’s LCD panel. 5.
I have a 6D Mark II paired with a 430 ex ii. I am using the Yungnuo 622c for wireless flash. The flash triggers and I can change everything via the on camera menu.
Wireless Camera Remote Shutter Release for Canon EOS M6 Mark II, R, RP, 6D Mark II, PowerShot SX70 HS, G5 X Mark II, G7 X Mark III, 90D, 77D, 800D, 200D, 250D, M50, Rebel T7i, Replace Canon BR-E1 4.1 out of 5 stars 170 NEEWER Upgraded NW635II-C TTL Camera Flash Speedlite with LCD Screen, Speedlight Compatible with Canon EOS R6 R5 R3 R M6 850D 800D 760D 750D 650D 600D 7D Mark II 7D 6D Mark II 6D 5D Mark IV/III 4.3 out of 5 stars 98 JJC 3-in-1 Wireless Flash Trigger & Shutter Remote Control with Two Receivers Kit for Canon EOS R5 5D Mark IV III II 6D Mark II 7D Mark II 5Ds R 1DX Mark III II 1Ds Mark III 50D 40D 30D dummy Godox X1R-C 2.4G Wireless Flash Trigger Single Receiver for Canon (X1R-C Receiver) Pn5X.
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    • canon 6d mark ii wireless flash