How can a transient name-id format be set for my apps?

Currently the Okta IDP metadata shows two name-id formats:
md:NameIDFormaturn:oasis:names:tc:SAML:1.1:nameid-format:unspecified</md:NameIDFormat>
md:NameIDFormaturn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress</md:NameIDFormat>

Few months back, I was able to select a transient name-id format, but I am unable to see that option now:
md:NameIDFormaturn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress</md:NameIDFormat>
md:NameIDFormaturn:oasis:names:tc:SAML:2.0:nameid-format:transient</md:NameIDFormat>

Kindly suggest on this.

you would need to specify the transient nameID format in the app settings in order to have it present in the metadata

this can be done either through the admin console or using the apps api