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,
If the reply was helpful, please upvote and/or accept it as an answer, as this helps others in the community with similar questions. Thanks!
@Matthew Bx If you still have questions, please let us know in the "comments" and we would be happy to help you.
If any of the replies below has been helpful, we appreciate hearing from you and would love to help others who may have the same question. Accepting answers helps increase visibility of this question for other members of the Microsoft Q&A community.
Thank you for helping to improve Microsoft Q&A!