A couple of options:

You could optionally configure a different template for each tenant so you could hard code the correct URL in each template.

You could also add the correct URL to the tenant.data and then pull it out in the template during render so you could use the same template across tenants.

If the state parameter is working well for you for other APIs, you could open a feature request in GH to add this to the API in question.

Since both APIs are technically the same, is there a way to use the email template defined for the Setup Password with the Forgot Password API?

Yes. Navigate to 'Tenants -> your tenant -> Email' and you can set 'Setup password' and 'Forgot password' to be the same template.

There may be template variable differences, please consult the documentation and ensure you are checking for existence before you rely on them:

https://fusionauth.io/docs/v1/tech/email-templates/email-templates/#setup-password

https://fusionauth.io/docs/v1/tech/email-templates/email-templates/#change-password

I figured it out…. I just had to put state.client_id in parens so it resolved them together.

[#assign clientId = (state.client_id?string)!"dafb6ef6-a2a8-4d34-9d69-59bfed3e31aa" /]

Kickstart does not load any templates by default. You will need to create any template you’d like in your initial configuration.

Outside of kickstart we do build some default templates. In Kickstart, no templates.

Here's the email templates we ship with if you want to add them to your Kickstart: https://fusionauth.io/docs/v1/tech/email-templates/email-templates#templates-replacement-variables

See also https://github.com/FusionAuth/fusionauth-issues/issues/612

Yes. Set the locale in the template and this will display the correct values, for example the month name.

More on freemarker here: https://freemarker.apache.org/docs/

Here's how to set the locale in a template: https://freemarker.apache.org/docs/ref_directive_setting.html