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Doubtful, I've not heard of a quick release adaptor for a 148mm boost spaced wheels, only for 142mm spaced wheels.
Best solution is to return it and just get a 141mm spaced wheel, like this
https://www.tritoncycles.co.uk/components-c9/wheels-c126/alex-md35-boost-141-27-5-mtb-wheel-p22949
The adaptor is to convert to 135mm on a normal 142mm thru axles hubs, not for the 148mm boost thru axles.
Did you removed the cap from the hubs before fitting the adaptor?