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TPS55340: Inductor value

Part Number: TPS55340

Dear Team,

Our customer says that I want to use an inductor of 1uH(7m-ohm) on the following conditions.
Vin=11-13V, Vout=26.5V, Iout=1.8A, Cout=10uF x 2;

I used WEBENCH with a switching frequency as 1.2MHz, but come off from recommendation.
What kind of problem will happen when customer use this design?

Best Regards,
PAN-M