Dual display on Pi4 stuck on "applying configuration"

I’m trying to use the dual display feature with my Pi, but I’m stuck on “applying configuration”.

It’s weird, because the device updates almost instantly when I make other changes.

I was reading on the community forum for answers to the problem. One person said it just took some time for the configuration to change. About how long should this take? Thanks!

For reasons still unknown to me, your device has the unexpected signature “MSDOS5.0” within your SD card partition information. The sanity checker handling OS updates refuses to work when that happens as updating the OS expects a certain disk layout which your device didn’t have. I’ve fixed this remotely and changing the configuration should now work. I’ll contact you by mail as I still don’t understand why this happens from time to time and I’m unable to reproduce this in any way locally.