A 403 error means that you do not have permissions. Since you are having issues accessing the ExtensionMicrosoft_AAD_IAM blade, it could mean that the admin of the tenant has not given the permission to access the "Admin Portal" with a non-administrator account. This can happen even if you are an Owner of the subscription since the IAM policy of the Entra ID/Azure AD tenant will still block you in this scenario.
If this is the case, the admin needs to either set "restrict access to Microsoft Entra ID administration center" to "No" or grant you an admin role.
If you believe that this is not the case, please provide a fiddler trace when you navigate to that error page, and share what you see in the ForbiddenResponse (whether you see the RequestFromUnsupportedUserRole error or something else)
Other possibilities:
- Sometimes this issue occurs if there is something blocking the network connection. If this is the case, this issue can often be resolved by whitelisting the required endpoints as mentioned in our Microsoft documentation: https://learn.microsoft.com/en-us/azure/azure-portal/azure-portal-safelist-urls?tabs=public-cloud#azure-portal-framework
- Please try updating the browser to the latest version and check using the Chrome browser instead of Edge to see if you get the same results.
- Please try to load the "Entra ID" blade from the Search bar by searching for "Microsoft Entra ID" and confirm if you get the same results that way.
- If you still receive this error after trying these steps please capture a browser network trace and share if you receive any additional errors when clicking on that page. If all else fails, feel free to reach out to me at AzCommunity@microsoft.com ("Attn: Marilee Turscak") and include your subscription ID and I can enable a support request to investigate your issue.
If the information helped you, please Accept the answer. This will help us as well as others in the community who may be researching similar issues. Otherwise let me know if you have further questions.