I'm running into a very similar issue with my new-to-me 2021. It's got the original battery, about 30k miles. I'm the second owner.
Since I bought it, I periodically ran into symptoms of battery/charging issues - auto start/stop not working, chimes coming from the IPC. Over the last two weeks, though, it has worsened into "deep sleep" mode, FordPass not working due to battery level, none of the remote/walk up features or keyless entry working. I have an appointment at the dealership tomorrow to have them evaluate the battery and BMS, but I'm not optimistic they'll get to the bottom of it.
I'm looking at replacing the battery myself if they don't. Does anyone have any insight on the Antigravity lithium battery sized for our trucks? I have one of theirs in my motorcycle (Triumph Tiger 800) and love it - much lighter-weight, and easy to keep topped off.