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One day my phone just decided to not detect my SD card. So I plug it on my PC and whenever I click the drive it always ask to format. On Disk Management, it is recognized as Raw (healthy partition) with only 5.71 GB capacity. The missing volume doesn't appear as unallocated, it just vanish. I can't even use partition recovery cause that partition doesn't exist.. I can't also use TestDisk to analyze cause my card is wrong size. Where did my 20+ GB go? And how can i make it just even visible as unallocated? Thanks for any input.

PS. Any type of formatting just end up a failure, and all of them displays 5.71 GB as my max capacity.

Your SD card is broken. Please consult a professional recovery service.

You can only format existing partitions with the exemption of supperfloppies.
As there is no partition, there is nothing to format for you.

Same problem here. I've already tried the following to format it:

diskpart
chkdsk
sd card formatter
rmprep
aomei
gparted

but no luck.