No, you should be able to moderate via your lemmy.ca account.

There are still a few issues with cross-instance moderation, but these will be fixed soon enough with the new lemmy API v1.

If you have a community in mind let me know :)

Hey sorry, do I need to be on the same instance to volunteer?

I crossposted this here incase there are any people here with similar communities to the dead / empty ones listed above who'd like a redirect to their active communities or take a community to revive :)