Microsoft project management software used to plan, manage, and communicate a project schedule and other information among workgroup members, project managers, and other stakeholders.
Please note that our forum is a public platform. Kindly ensure that you hide any personal or organizational information to protect personal data.
Hi peter benson
The address ending inonmicrosoft.com is a Microsoft 365 tenant account that is automatically created when a new Microsoft 365 Business subscription is set up. It is not intended to replace your personal email address, and it does not automatically forward messages to your regular email account. Because Microsoft Planner is a Microsoft 365 work or school service, it requires a work or school account to sign in. That is why the system created the onmicrosoft.com account during the subscription process.
To access Planner, please try signing in at https://planner.cloud.microsoft using the onmicrosoft.com account and the password that was created when the subscription was purchased. If you can sign in there, you should also be able to access the Microsoft 365 Admin Center.
Regarding contacting Microsoft directly, as this forum is a peer-to-peer community, so while members can share advice and experiences only, it doesn’t offer phone or live support. However, Microsoft Support can assist with subscription, account, and sign-in issues. You can contact Microsoft Support from Microsoft 365 Admin Center
If you can sign in to the Microsoft 365 Admin Center using the onmicrosoft.com account, select Help & Support in the lower-right corner to create a support request with Microsoft support engineers. For further instructions, you can follow this guide: Get support - Microsoft 365 admin | Microsoft Learn.
You can also contact Support team via phone service number: Customer service phone numbers - Microsoft Support or go to Contact Us - Microsoft Support
I hope this information helps and if you have extra questions about this answer, please feel free to ask via comment section.
Note: Please follow the steps in the forum documentation to enable e-mail notifications if you want to receive the related email notification for this thread.