Welcome to the ODK forum, @amzie91! We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a picture as your avatar because it helps build community!
For your question about the link...
- Just to confirm, this is using an ODK Central server that you have set up?
- Are you able to share the country of the server, and the country where the users are having the issue?
- Just to confirm, this is with the form still in draft phase? As described here: https://docs.getodk.org/central-forms/#working-with-form-drafts
- What is the issue the users see? Are there error messages/pages?
For your question about the QR code...
- What do you mean by "can't scan my QR code"? Is it giving an error message of some kind?
- How did you generate the QR code? Is this the QR code to register an app user in Collect?