Hi Matthew,
Welcome to Q&A Forum, this is a great place to get support, answers and tips.
Thank you for posting your query, I'll be more than glad to help you out.
you might be right, that there aren't any specific network rules that you have implemented BUT there might be some to secure your US based office, or better how is your US based office connected to the storage account and/or to your Azure network?
If you can reach that storage account via (public) internet from your location then it should be also possible to reach that SA from a different location via (public) internet! If not, there might be a blocking issue somewhere in your network configuration.
Maybe this post might help you to troubleshoot your connection issue...
I hope my answer is helpful to you,
Your
Bjoern Peters
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