This error message typically occurs when a user tries to access Azure resources using personal account or user may not registered with Azure account, may I know have you created a Azure account and provided the details like phone number, email and payment details?
If this is the case, you need to follow below the steps here: Cause 1: Users log in to Microsoft Entra admin center by using personal Microsoft Accounts
As you mentioned you are trying to create a new Azure account with your work email, so here might be the issue happen because your work email is already an Azure account which is created by you organization admin and has Restrict access the portal. If this the case, you need to reach your organization admin and ask to allow the access.
If you've followed all the steps and the issue still persists, try signing out and signing back in. If that doesn't resolve it, clear your browser history and cache, then try again. Alternatively, switching to a different browser may help.r.
Error AADSTS50020 - User account from identity provider does not exist in tenant
Hope this helps. If you still do not see enough information to isolate the issue, please let me know in the comment section.
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