Nice, if you don't mind me asking, which Service Ontario did you reach out to?I was able to get OHIP for my spouse (temporary, valid for 1 year) using simply the email asking for the permanent residency fee to be paid, accompanied with the payment receipt of said fee (we did the application and chose to pay that fee when requested). We hadn't gotten any email with approved in principal or similar implied message, we believe it was because it moved so fast.
The lady there reached out the immigration office and they confirmed that was plenty enough to be considered as approved.