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btconnect.com is BT Business email.
This the BT Residential Customers forum
As you are a business user, please could you post on the BT Business forum at http://business.forums.bt.com/
Thanks
Changed to residential and kept btconnect email address
That is not possible, which would explain why it is not working.
As @licquorice has said, once you move to BT Residential, you lose access to btconnect.com. This should have been explained to you when you cancelled your business account.