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Please try adding a LightBox embedding code to your Squarespace website homepage to see if it works as expected.
1) Get a form LightBox code with enabled 'Open on Page Load' option.
2) Add the LightBox code by using a Squarespace Code Block to your website homepage.
If you need any further assistance on this, please let us know.
On behalf of my colleague, you are welcome.
I have moved your question to a new thread and you will be answered here: https://www.jotform.com/answers/878138