There will probably never be a general ISBN import working for all documents from all countries: there is simply no universal database for these identifiers (unfortunately). And local databases might not be easily accessible programmatically, if at all.
This problem exists for all countries, not just Canada, but it can usually be easily addressed using Zotero's recommended input method, which is to retrieve the reference from a relevant web page. If you share some ISBN examples, someone can check whether something isn't working right with them (bugs happen), or whether a convenient website exists from where they could be captured, or, finally, a web translator script should be written for an authoritative website that hosts these documents.
Can you please just post one or two of the ISBNs you have tried here, so we can test with the exact same one? Providing a reproducible *example* is part of every helpful error report.
@gizemkezban: OK, you're banned from further posting here. You've been asked repeatedly to provide an example ISBN, and for some bizarre reason you're refusing to do so and instead just keep posting these pointless rambling responses. I have no idea why you're doing this, but it's certainly not a way to get an issue resolved.
If you'd actually like to help us fix an issue you're experiencing, you can provide some ISBNs and we'll approve that post, but otherwise I'm not going to let you waste any more of people's time.
Upgrade Storage
This problem exists for all countries, not just Canada, but it can usually be easily addressed using Zotero's recommended input method, which is to retrieve the reference from a relevant web page. If you share some ISBN examples, someone can check whether something isn't working right with them (bugs happen), or whether a convenient website exists from where they could be captured, or, finally, a web translator script should be written for an authoritative website that hosts these documents.
If you'd actually like to help us fix an issue you're experiencing, you can provide some ISBNs and we'll approve that post, but otherwise I'm not going to let you waste any more of people's time.
So yes, all of those work fine for me. This is why we ask for specific identifiers.
Can you provide a Debug ID for a save attempt that fails?