Occasional backend updates can trigger temporary lockouts.
To avoid future lockouts:
A locked NETFILE account usually happens after five unsuccessful attempts cra netfile account locked
Before calling the CRA, have the following documents ready to prove your identity: Occasional backend updates can trigger temporary lockouts
If your CRA access is locked, it's usually because you've hit the 5-attempt limit for filing. The "Hidden" Lock cra netfile account locked
Contact the individual income tax enquiries line at 1-800-959-8281 .