Laptop application "To Do" not working

Hi @Milind, 

Welcome to Microsoft Q&A forum. 

Based on the information and screenshots you provided, the issue is that you cannot log in to the To Do desktop app and are receiving an "account not supported" error. This is understandable, even if it appears you have a correct license according to Microsoft's documentation. 

To be specific, this problem is related to your account and license configuration, not an issue with your device or the application software. 

To identify the correct root cause and provide you with the proper guidance, I have outlined the key steps to check your account's licenses. 

Step 1: Please confirm your exact subscription. 

This is necessary to verify if your account includes the Exchange Online service. 

The Microsoft To Do app has a technical requirement and needs an active Exchange Online mailbox to store and sync your tasks. 

Please go to your Account Portal and check your "Subscriptions" page. We want to see if your account is licensed for a bundle (like "Microsoft 365 E3," "Office 365 E3," or another plan) or if it only lists "Microsoft 365 Apps for enterprise." 

If your account only shows "Microsoft 365 Apps for enterprise," this is the root cause of the problem. The To Do desktop app is not supported with this standalone subscription because it does not include the required Exchange Online service. 

Step 2: Contact your administrator if your account has a bundle license. 

It appears the root cause is that the specific services for To Do are disabled within your account, even though your main license is correct. This is a setting that only your IT administrator can adjust. 

1. First, please reach out to your IT administrator. Kindly check with them your account and ensure the individual service plans for both "Exchange Online" and "Microsoft To Do" are enabled. 
2. After your admin confirms they have made this change, the final step is to reset the To Do app to clear its old credentials. You can do this by going to Settings > Apps > Installed apps, finding Microsoft To Do, clicking Advanced options, and selecting Reset. 

After that, please try logging in again. 

I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this.  

Thank you for your patience and your understanding. If you have any questions, please feel free to reach out.  

I'm looking forward to your reply.

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