Did not receive key for whisper mount

[Tinydragon]

I quested all of the yo-kai minions, got the completion notice, but did not get the key to summon the Whisper mount. Is this a bug or is there something else I should do to get the mount? I can find nothing in game and Customer Support was remarkably unhelpful.

Thanks in advance.
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Should have searched the forum better. Apparently, I need to go to see Jonathas in Old Gridania. Makes sense, even if it is not intuitively obvious.