While Okta does not provide an out of the box solution, the best way to send users different activation emails (based on different app assignments / roles within organization) would be to assign different values for the locale attribute for the user subset in question.

 For example, users with the locale value en_US should receive the template `activation email 1`. Users with a different locale value should receive the template 'activation email 2`

 More details can be found here Mapping Location Attribute from Profile Master to Locale attribute in Okta profile results in null value.

If you are creating a user via API call, the following example can be utilized:

API call: {{url}}/api/v1/users?activate=true

Body: {

"profile": {

"firstName": "Test",

"lastName": "User",

"email": "test.user@domain.com",

"login": "test.user@domain.com",

"locale": "es_ES"

}

} 

  It is recommended to test this flow on a Preview environment before deploying in Production.

That's great, except I'm already doing what you are suggesting.

What I need to do, is translate the page located at /user/welcome

How do I do that?

So, that when the user clicks on that link in the activation email, they see the correct page.

Thanks!