Depending on the capacity of the microSD card in question it is very likely to be formatted only one of two ways: FAT32 if it is up to SDHC sized, and exFAT if it is an SDXC sized card [I cannot remember the GB level where HC becomes XC at the moment].
Android phones don't format microSD cards as "internal storage" they format them based on the capacity of the card in one of those two filesystem formats.
I have had two microSD failures where the card was sometimes detected, sometimes not, and when it was detected by either another phone or the computer their respective error messages about the card being in need of formatting before being usable appeared.
I will be shocked if anyone can propose anything that would make that card viable again, or even readable again.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Presenting the willfully ignorant with facts is the very definition of casting pearls before swine.
~ Brian Vogel