"Couldn't move app. Not enough storage space." I have factory reset my phone, inserted & formated a new 64GB MicroSD Card As my wife bought an Android Phone last year, she has been using an 8GB MicroSD card, recently she wanted to increase more storage space due to having more music and photograph files. As such, I bought a new SanDisk 64GB MicroSD card Class10. 

I have successfully formatted the 64GB MicroSD card using the phone's Format function and copied all her photos and music files into the card, I can view all the photos and play the mp3 with no problem. I can also successfully install Apps from PlayStore.

The problem comes when I start to move Apps from Internal to SD using the "Move to SD" function, which will prompt me "Couldn't move app. Not enough storage space."

So I thought there might be some residual apps data somewhere in the phone memory, hence, I factory reset the phone, reformat the 64GB MicroSD, and copy all the photos (folder name: Pictures) and mp3 (folder name: Music) back into the MicroSD. Although I have nearly 50GB of free space in the MicroSD, unfortunately, I am getting the same error again. 

Details of the phone:
Model number: e1901_v77gq2008
Android Version: 4.1.1
Build Number: e1901_v77_gq2008_20130131

Appreciate advice for any kind soul.
With some models of phones there is a difference between "internal SD card" and "external SD card", where the former is just a link to the phones internal storage (whyever). The latter is your real SD card.

It might be that you are not able to use your SD card in the way you like due to this limitation. Using a file explorer, can you see a difference between /storage/sdcard0 and /storage/extSDcard (or similar entries)?

What puzzles me most is that you said the problem occurs after a factory reset. So not even the smallest app is movable?