@user17561777520 , if the work you are doing is performed in WA, then the income from that effort is WA sourced. Thus there is NIL withholding requirement for AZ. Infact generally you would not be an employee but a contractor/self-employed of the entity in AZ Generally they should be issuing you a 1099-NEC ( Non-employee compensation ) and nil withholding ( Fed, SECA/FICA, State ).
This is of course unless the entity has a branch-office/presence in WA ( even if it is only you ), in which case it would still be WA sourced but the entity can withhold taxes ( FED, FICA, WA).
Does this make sense ?