Hello @严炜 陈 , the AADSTS700056
error is being thrown due to trying to sign-in with a personal account (outlook.com, hotmail.com, etc) or a work account from an external tenant. Both are not supported by the ROPC flow. In order to sign-in you will have to use a local (to your tenant) account or an external account added to yout tenant as a guest.
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