We can’t sign you with this credential because your domain isn’t available. Make sure your device is connected to your organization’s network and try again. If you previously signed in on this device with another credential, you can sign in with that credential.
The error "We can’t sign you with this credential because your domain isn’t available" highly depends on whether the computer you are trying access is a personal one or you are using a public/work PC.
In the case of the former, you should contact the IT support that would grant you access to the network. If if it is your personal computer, there are several things you could do to fix "We can’t sign you with this credential because your domain isn’t available" error - you will require administrator's permission for that.
To find out more about steps you need to take to retrieve access to your Windows, please check out the following guide: "How to fix We Can’t Sign You With This Credential error?"