WDS server Login issue

[CMCCNEP]

I have installed WDS service on a standalone 2019 Windows server. On client side as I click on the boot.wim it takes me to the language setup screen but when i proceed with the next button a login windows pops up asking for user logins to connect to this server. I type in the required log in details, which is Administrator in my case, it ends up displaying an error message ? I have also uploaded the images displaying error message.

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