Hi mre SEZGİN, It’s really frustrating to run into a system error like this, especially when you're just trying to add your company email and get things set up properly.
To resolve the “Access denied for the resource error when adding a company email, ensure your Microsoft 365 account has an active license by checking in the Microsoft 365 Admin Center review Conditional Access policies in the Microsoft Entra Admin Center to confirm that sign in is enabled for the Microsoft Information Protection API, try adding the account from a different device or network to rule out local restrictions clear cached credentials via Windows Credential Manager create a new Outlook profile if using the desktop app and contact your IT administrator if permissions or access settings need to be adjusted.
What specific permissions or access configurations might be preventing your account from successfully adding the company email, and have you verified whether your organization’s policies or licensing settings could be contributing to the issue?
Best regards
Lucky Charm