misaligned keyway - stepper shaft vs pulley

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I got a bigger Nema 34 motor recently and ordered a pulley from BeltingOnline to match the shaft on the motor. Tried it out yesterday and the keyway on the motor shaft seems to be cut at an angle, see photo below. This in turn causes the pulley to get stuck as the key sits at an angle. Pulley fits fine on the shaft with no key, also the key fits nicely in the pulley keyway. Put all things together and it's stuck.

Any ideas on how to fix this with no heavy machinery?

Regards,
T.