Where can I use my mount?

I just completed the quest and used the whistle and it said "Mount unavailable in this location" almost everywhere. Where exactly can I use it? I read something about not in cities nor dungeons

Not in cities nor dungeons. Just walk outside and give it a try!

Quote:

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Originally Posted by MuseTraveller

Not in cities nor dungeons. Just walk outside and give it a try!

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After creating this thread I actually managed to use it