Forms: Making select field required

Im trying to make my select field required like the rest of the input fields where a popup error shows up if any field is missing. Right now, if the select field is empty, an error will only show up once you have filled in and sent the entire form, forcing the user to fill in the information all over again.

In short: I want a pop up error if the select field is empty, showing up before a user can press the send button. Like the image below.

I have made the fields required both inside the builder and forms backend. Is there something I have missed?

image

Did you check required for your select?

Skärmavbild 2024-07-30 kl. 11.22.29

Hi, yes it is set to required in both the builder and the backend.

Heres the link to the form: Boka Fönsterputs | 08 Fönsterputs