Hello @Gadsden, Reis Mercer ,
Welcome to the MS Q&A forum.
Based on the error message, it seems AAD administrator has disabled the app registration experience for your account in the Azure Portal.
Specifically, this setting:
If this option is set to yes, then non-admin users may register custom-developed applications for use within this directory.
If this option is set to no, then only users with an administrator role may register these types of applications.
Source: Delegate app registration permissions in Azure Active Directory
You need to contact your Azure AD admin and ask to grant individual permissions to create and consent to applications when the default ability is disabled, or process registration/management by using PowerShell or another client such as Visual Studio.
Hope above answers your questions and concerns.
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Sincerely,
Olga Os