Hello. I live in Canada and I am sponsering my 11-year-old daughter who is in Iran. Today I received a rejection letter because I had mistakenly not entered her name in the IMM0008 form at the time of my immigration. Of course, her name is in the rest of the forms. I have 30 days to protest. Can something be done?
Where _exactly_ is her name in the the other forms you refer to?
As others noted, a non-disclosed spouse or child cannot be sponsored in future.
I'm not saying it is a good chance, but there may be a possibility that you having shown the daughter on other forms would make it possible to avoid the lifetime ban, on basis that was clearly in error. (Note in some other cases seen here, IRCC has paused the PR application and required the parent to add children disclosed elsewhere - which for whatever reason didn't happen here).
If indeed you have disclosed her on other forms, then seeing a lawyer at least for a consultation may be worthwhile.
Again, though, I'm not suggesting that it is certain that this defence will work.