Mecool KM6 memory card issue

Hi all. I have a new Mecool KM6. I have a scan disk memory card inserted. The card formats fine and can be used as internal storage. However when I designate it as removable storage, I am unable to write. This also appears on the card set up screen. I am prompted to enable write, but cannot select card.
Do I have a faulty box or am I missing something simple. All apps have permissions. I have tried to move files from internal memory to card but keep getting unable to move file error.
Any suggestions would be greatly appreciated.
Thanks

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