Deaths prior to 1980, marriages prior to 1980, and births prior to 1930 may not be in electronic format.
When applying for a death certificate prior to 1980, marriage certificate prior to 1980 or a birth certificate prior to 1930, it can take up to an extra 6 to 8 weeks for the registration to be converted into an electronic format before processing can be completed
https://www.ontario.ca/government/death-certificateSandra
