Claiming VAT Tax Refund during train connection at Brussels Midi Station

We are traveling on the Eurostar from Amsterdam to London and have a connection in Brussels. We have about 45 minutes to change trains and I’m wondering if claiming my VAT tax refund in Brussels is even possible.

Apparently claiming in Amsterdam prior to leaving there is not a possibility and claiming in London before going back to the U.S. is also not a possibility.

Has anyone tried claiming their refund in Brussels during a connection? Or does anyone know where the office even is in relation to the Eurostar? I’ve tried researching but a lot of info is old or kind of hard for me to follow (I’m from an area in the U.S. that doesn’t have a train system so this is all very new and confusing to me). Also, I understand the office is closed a lot so I wonder if that’s another issue I’d be facing.

Any help would be appreciated!