You can get ride of the error using VAGCOM. Did it for my mk7.
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Steps for VCDS
Led license plate lights
Select STG 09 (wiring)
STG access permissions -> Function 16
Enter Unlock Code 31347
STG adjustment -> function 10
(1) Select Leuchte25KZL HA59-load type 25
Customize LED general - value at 43
(6) Leuchte25KZL HA59 dimming AB-25 Select
Adjust value to 127
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I got you. But having paid a good price for the parts, I'd like them to work as advertised.