EA portal and already an account created

May considering below:

1: Use a Different Email Temporarily

• Use a secondary email (e.g., an alias or shared mailbox) to set up the subscription.
• Once the setup is complete, you can reassign ownership or add the intended user via Access Control (IAM).

2: Ask EA Admin to Reassign You

• If you're not the EA administrator, ask the current EA admin to:
• Go to Azure Portal → Cost Management + Billing → Access Control (IAM)
• Add your email as an EA administrator or account owner
• Once added, you’ll receive an activation email to access the EA portal.

3: Remove Existing Association

• If you control the other subscription/account:
• Remove your email from the old EA enrollment.
• Wait for propagation (can take up to 24 hours).
• Retry adding it to the new department.