I tried to add a Newsletter form with Newsletter2Go code, but it didn’t work.
The html box just appears transparent and nothing happens.
Does anyone know if it works or how to make it work?
You are best suited going to Newsletter2Go own support to ask how they integrate their code with Wix.
https://help.newsletter2go.com/integrations-api.html
https://help.newsletter2go.com/automation/forms/how-to-embed-registration-form.html
https://help.newsletter2go.com/automation/forms/how-can-i-create-an-own-html-form.html
You could need to put some html code into the tracking and analytics section with the rest of the code being inserted into the html iframe.
https://support.wix.com/en/article/embedding-custom-code-to-your-site
https://support.wix.com/en/article/adding-html-code
However, they do their own Rest API, so you can always use that instead of trying to use html code, which would be the better option if you can do it.
https://docs.newsletter2go.com/?version=latest
https://support.wix.com/en/article/corvid-accessing-third-party-services-with-the-fetch-api
https://www.wix.com/corvid/reference/wix-fetch.html
Thank you, I will look into that!