Thank you for reaching out to us through the Community. At this time, we do not have an app that allows you to add a newsletter sign-up form to your Facebook Group. We currently only have this option for Facebook Business Pages. As a workaround, you can post the sign-up form URL to your group and if you are the administrator of the group, you can pin the post which will keep the post at the top of the group's feed until you manually remove it. For more information and the steps to locate the sign-up form URL, please click here. I do apologize for any inconvenience this may cause, but I hope this workaround helps. Please let us know if you need assistance with anything else.
Lucas_D Community & Social Media Support
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