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You have a $60K limit on your ED. My hunch is that you're at their internal max.
Which Business Amex are you trying to get?
What was the last denial reasons?
I am like "wandering" I finally was able to get the SC for 3k limit.
I don't know if cancelling a personal card will help. Perhaps they can move your limits around? I don't other issuers do this betwee personal and business but don't knowabout amex.