All right. Had same issue with my Note 10 plus. Factory unlocked no languages for keyboard as yours. Samsung tech support tried to fix it without luck. They've told me to wait till next os update but it's taking to long. So what I've did, I've installed swype keyboard from google play. Installed all the required languages (for me it was russian and armenian), then made it as my main keyboard. Typed like 2-3 words, after that uninstalled it. Samsung keyboard became main keyboard automatically, and when I went to add more keyboard languages, every other languages became available for samsung keyboard. Worked for me and my wife's note 10. Try it.
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