You shouldn’t have been able to get approved for an eTA as a permanent resident. It means one of a couple things:
- The system is not yet complete enough to catch all PRs OR
- You are no longer a permanent resident OR
- You have a common name.
You may learn more at the port of entry.
If you successfully enter Canada, you should apply for a new PR Card if you qualify, or remain in Canada until you qualify to apply for one, provided you still have your permanent resident status.