Question: Series of Kummer function works only with the third variable

HI, 

I am using the series function on KummerU (Kummer function of the second kind). 

I found that series(KummerU(p,1/2,t),t) works as below, but series(KummerU(p,1/2,t),p) gives me the following error "Error in (series/fracpower) unable to compute series". 

Any idea what that is the case 

Thanks

series(KummerU(p, 1/2, t), t)

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