I have set up and registered some user meta fields using Metabox User Meta (code below). When I create a user using a gravity form / the gravity form user registration plugin then user is created but none of the custom meta fields save. The custom fields are all empty 🙁 I have tried matching the Metabox field ID with the ID of the form field in Gravity forms and I also tried the matching it with the field label. Neither works 🙁 See screenshot below:
To make the plugins work together, the key for user meta fields must be exactly the same. I remember Gravity Forms automatically creates key for fields which includes some numbers (the number 7 in your screenshot). I'll check more with GF. In the meantime, can you check if you can change the key for fields? It must be case-sensitive.