Are you renewing or are you applying under the AIP/PR Applicant category?
I didn't renew. I applied for OHIP using the AIP letter. I brought 2 proofs of residency in Ontario (they asked for 1 but I bought 2 just in case - I used a Bank Statement and Visitor Record) and a Registration for Ontario Health Insurance Coverage form, an AIP letter, and my passport.
Remember to go to the bigger, full-service ones, NOT ALL ServiceOntario know about this. You can see more information here:
https://www.ontario.ca/page/apply-ohip-and-get-health-card
Hope this helps!