Problemas passing contact parameter from HS from to exterl URL (calendly)
The default hubspot form success text doesn't support HubL code or javascript. So you are going to need to bypass this and create your own using a custom module. HubL is the code language that dynamicly adds the contact name and email. Do you have an internal developer resource who can help you with this?
Problemas passing contact parameter from HS from to exterl URL (calendly)
How are you doing this part of the process "User is redirected to external URL with contact parameters". On your landing page you would need to use javascript + hubl to look for an event listener and then create the redirect url that way. I would try creating a custom module that has your form submit listener in it to create the redirect url.