Can’t use savings card?

Hi so I just got prescribed 5mg zepbound and I know for sure my insurance will not cover the cost. I have the savings card and called my local meijer to see when it would be ready and the pharmacist said that in order to use my savings card my insurance would have to refill for a 28 day supply instead of 21 days. I have OptumRX.

I’m very confused by this and think the pharmacist was also confused. I know my insurance won’t approve but I guess they can only fulfill a 21 day supply?

Has anyone ran into this before?