Comodo Certificate Authority
PlatinumSSL Legacy Certificate
PremiumSSL Legacy Certificate
Comodo does not recommend the use of any of their Legacy certificate types. For this reason, you will not see the Legacy certificate types listed during the creation of a Comodo CA Template.
Please contact Comodo for a replacement recommendation.
For those using the PlatinumSSL Legacy Certificate, the general recommendation it so use the InstantSSL Certificate Type.