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Hello Robert,
The following conditions might cause this issue:
Your subscription has expired.
Your user account is not enabled.
You're locked out of your user account.
You tried to sign in with the wrong user name and password.
The password you tried to sign in with is temporary and expired. (This might happen if your user account is new or your password was recently reset.)
Your password has expired.
You're blocked from signing in.
If you're a federated user, single sign-on is not working.
Do follow the below link to resolve the issue,
https://learn.microsoft.com/en-us/office365/troubleshoot/sign-in/sign-in-to-office-365-azure-intune
Hope this answers all your queries, if not please do repost back.
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