I wouldn't be too concerned about the prior use for weight loss. It really comes down to how your doctor submits the reasonings for Ozempic in your particular case. Not using Metformin as a first tier treatment may cause issues, especially if there only may be an interaction with your other medication. If there was a definitive reported interaction or there is a known and significant interaction between the Metformin and the other drug, then it may be approved. But a "it might have some interaction" may come back with a "try Metformin first to determine if there is an interaction and efficacy". I am not a doctor nor do I evaluate SA submissions, but I do know they don't vary much from their treatment tier guidelines without a really good and documented reason. But I am hoping it does get approved for you.

Edit, add info: Something to discuss with your doctor is Jardiance if the Ozempic doesn't pan out. Jardiance is also considered a first tier med like Metformin.

And Happy Holidays to you as well!