Hello @fabriciocastelo
TurboTax Online allowed a maximum of 30 characters for Last name. This is a limitation from CRA. As of the issue about not having the same last name from what you entered on your TurboTax return and what CRA have in their files, for that you will have to contact CRA to be able to Netfile your return.
Update your CRA information: Change your name - Canada.ca
Thank you,
Magalie
