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There is a convenience store in the HZMB (Hong Kong–Zhuhai–Macau Bridge) Hong Port where one can recharge an Octopus card via cash only (credit and debit cards are not accepted).
Convenience store information: Circle K, Boundary Crossing Facilities, Hong Kong, https://maps.app.goo.gl/g5coBRniHGRKT1DB7
It is located next to the machines to purchase shuttle bus tickets with an Octopus card (specifically, between the machines and the exit door where one has to go through to start queuing for shuttle buses after purchasing the tickets).