authentication problem

I was asked to help solve a problem with accessing contents that requires authentication on a windows website.

It turns out that only IE users can go through the authentication box, and not all IE users can use it.

Unlike the more common authentication box that includes a username field and a password field, this one also has a domain field.

Why can only some users use this box successfuly (all have the IE same version)? What can/should be done by others in order to be able to use it?

 

 

 

 

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