I applied for an eTA yesterday, and received an email this morning requiring unspecified documents, and a link to register. I've created a GCKey ok, but wasn't forwarded to the IRCC registration page, just to the generic IRCC site (via a language selection page).

I've reported this technical difficulty via the IRCC webform, no reply as yet - I know, it's overnight Canada time

Does anyone have any insight on how I can register with IRCC, link my eTA application and find out what documents are required?

'Me too' stories about the complex process also welcome...

Many thanks!