The new ‘connect printer via IP’ option that is new in Bambu Studio 01.10.00 (and 01.10.01) for A1 printer will only work for printers with firmware version 01.04.00 and onwards.
This firmware has not been released yet, so this feature will currently not work with the A1 printer.
Possibly the 01.04.00 firmware is available in the beta firmware program but I’m using stable releases only.