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It appears that you may be attempting to sign in to the AWS Management Console using the wrong sign-in page for your newly created IAM Identity Center user. When you create a user through IAM Identity Center (formerly AWS Single Sign-On), the sign-in process is different from that of a standard IAM user.
Instead of using the regular IAM user sign-in page where you enter the account ID, username, and password, IAM Identity Center users need to use a specific access portal URL to sign in.
To sign in with your new user:
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You should have received an email invitation when the user was created in IAM Identity Center. This email contains a link to your organization's access portal.
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If you don't have the email, you can ask your AWS account administrator for the access portal URL. It typically looks like: https://d-xxxxxxxxxx.awsapps.com/start
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Once you have the correct URL, go to this access portal.
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Sign in with the email address and password you set up for this user.
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After successful authentication, you should see the AWS accounts and applications you have access to.
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Select the appropriate AWS account to access the AWS Management Console.
If you're still unable to sign in after following these steps, double-check that your user is properly set up in IAM Identity Center and that all permissions are correctly assigned. Also, ensure that you've completed any required email verification steps.
Remember, IAM Identity Center users cannot use the standard IAM user sign-in page with the account ID. They must always go through the access portal specific to your organization.
Sources
Troubleshooting AWS account sign-in issues - AWS Sign-In
Troubleshooting issues with AWS account creation - AWS Account Management
answered 2 years ago
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asked 3 years ago
asked 3 years ago
- AWS OFFICIALUpdated 5 months ago

You have to use the URL provided in Identity centre to login with. You do not use the same logon screen as you would do logging in as an IAM user
Thanks, but what started this was that I wanted to actually ask a question here on re:Post as an IAM user instead of doing so as the root user (which I am doing now—but I wish to do as little as possible with the root user and access it as seldom as possible).
However, when I try to log in here, that is the login form that is always presented to me. Is there some other way I can log in to re:Post? Will that portal URL provide me with a way to log in here too? Because once logged into AWS it always redirects me to re:Post and asks me to log in again with that other form (with the AWS account ID).
Nevermind, I was able to access re:Post after signing in through the portal link.
It did still redirect me out to re:Post and ask me to sign in again with an AWS Management login, but it seemed to recognize that I was already logged into the console through the portal, and I am now commenting on this post as my new AdministratorAccess user. So, success!
I will mark the above answer as “answered” with the account I used to ask the question originally after this. Thanks again.
But I will say that this process was rather convoluted and not at all straightforward. Even verifying my re:Post account as the new user was problematic, as it kept making me sign in to re:Post using that other form. In order to get it to work I had to copy the email verification url from my email and paste it into a tab that already had an authenticated session in re:Post, as the new user. Just clicking the link and opening a new tab as it does naturally only lets me log in with that other form.
Although, I am just realizing now that I did this while using incognito mode on my device, so that is likely the reason I couldn’t get to the right form. Oops!