I cannot log into myGMC app on my iPhone 13 mini. After entering my email and password, I get a popup that says "Unsupported Version" and an application update is required. Clicking "update now" takes me to the App Store and the myGMC app but there is no update available. It's showing my current version as 6.23.1. My iPhone is running iOS 17.3.1, which is the latest version available for my phone. Then after several login attempts I get a "Service Unavailable" popup that says to contact an Advisor for assistance. I have deleted and reinstalled the app several times and that doesn't fix the problem.
