Login issue (10 phone partnerships out of the maximum allowed 10 partnerships)

Good Morning,

I received the following email from Microsoft when I login the ID:

You have 10 phone partnerships out of the maximum allowed 10 partnerships. After you reach the maximum, you can't create additional partnerships until you delete existing ones from your account. To do so, sign in to Outlook Web App, click Options > Phone > Mobile Phones, and delete any unused partnerships.

When I login my ID in outlook in mobile same error shown to remove phones that we are no longer using from our account (partnership?) but without login my ID how can i remove the partnership? Please let me know how to do that.

Thanks,

Khurram Shaikh