Microsoft ToDo associated with Microsoft365 Business does not work on the web

I have a Microsoft 365 business plan. I am able to use the Microsoft To-Do app on Windows store to login to the tasks and manage them. I am able to use the Outlook on the web. I am able to use the Microsoft Planner app on the web as well.

However, when I try to login to https://to-do.office.com on the web, I get the following error:

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Your account doesn't work with To Do

Your account isn't on Exchange Online, so Microsoft To Do doesn't support it. Contact your IT admin for more info.

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This does not make any sense. There must be an Exchange Online account because I have an active Microsoft365 business subscription.

I have a personal account and I am able to use ToDo on the web from this account. I had thought if the personal account is interfering with the business account and signed out of it. Even then, the same issue recurs.

Please help in resolving this issue.