Since the Android 11 upgrade, Sdxc cards not longer function correctly. 512gb sdxc shows as 495gb, but Galaxy Tab A 10.1 2019 can only use first 32gb. Was working fine with Android 10.
The same issue with S10e. 1Tb sdxc shows as0.98TB but can only use first 64gb.
What's up with that? have unmounted, reformatted all per instruction, to no avail.
On the Tab A, I'd recommend using a program on your computer to format it FAT32 and see if that works.
As for it showing as 495gb, I bet if you dig a little further you'll see that it's actually 512 billion bytes, not 512gb. This is typical for flash storage, and all storage.