Glad to hear you got it worked out!
Just to clarify the solution you found on your own (for anyone else reading this); do you mean to say your domain was in another customer account separate from your Managed WordPress hosting?
If it was/wasn't, I think the steps on modifying the DNS A record covered in Change an A record would help in either case. Just a little extra info to help anyone else out running into similar roadblocks on their own.
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