Hello Laura Clark,
Greetings and Welcome to Microsoft Q&A!
I understand that you are unable to access Azure Language Studio with your personal email, it is likely due to recent changes requiring a work or school (Microsoft Entra ID) account instead of a personal Microsoft account. Since your Azure subscription is linked to your personal email, you may need an alternative approach to continue using the service.
Invite your personal account as a guest in a Microsoft Entra ID tenant. If you have access to an existing Entra ID (formerly Azure AD) organization, you can add your personal email as a guest user and grant it the necessary permissions. This allows you to use Language Studio while keeping your current subscription.
kindly refer this Add a guest user and send an invitation
Create a free Microsoft Entra ID account and link it to your Azure subscription. Once set up, you can sign in to Azure Language Studio using this new work account.
Check access permissions in the Azure portal under Azure AI Services > Language Service and ensure the user has the necessary RBAC role assigned in the Access Control (IAM) section.
If authentication issues persist, resetting the user’s password in Azure AD and verifying Conditional Access Policies under Azure AD > Security > Conditional Access can help identify any restrictions.
Browser-related issues can sometimes cause login failures, so clearing cache and cookies, using incognito mode, or switching to a different browser or device may resolve the problem.
It’s also important to verify subscription and tenant settings by ensuring the subscription is active and checking if the user is in the correct tenant under the Azure Portal > Subscriptions section.
If Still issue persists, Reviewing Microsoft Entra ID Sign-in logs under Azure Active Directory > Sign-in logs can provide error details, such as AADSTSxxxx codes, which indicate whether access is blocked due to Conditional Access or MFA restrictions.
I hope you understand. And, if you have any further query do let us know.
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