How do I rectify my name within the account application?

SEND MESSAGE TO CLIENT SERVICES

Please send a message to Client Services with a proof of identity document explaining the reason for the mismatch. We will rectify your name once we receive your proof of identity document.

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There is not enough space to enter my full name in the application
I submitted a proof of address and I received an email that the document submission did not resolve the issue. Why?
What is acceptable for Proof of Address and ID for an IB Canada application?