Legal Designation Of Heir [maryland]

My uncle, who was a resident of Maryland, passed away 3 years ago without leaving a will. He has no heirs other than his sister (my mother). I retained a lawyer to be the executor of his estate. He produced the Letters of Administration which list my mother (and nobody else) on the "List of Interested Persons" page.
Now here's the problem. Unfortunately, my uncle left a sizeable amount of money in a bank account in, out of all places, Lebanon. Despite the freeze on bank accounts there, we are trying to get the bank account transferred to my mother. I retained a lawyer there who, after almost 2 years, came back saying that the judge would not approve the request he wants a probate of the designation of my mother as the sole heir. He said he reviewed the laws of Maryland online and a judge in Maryland should approve and confirm the decision of the Maryland lawyer that my mother is the only heir.
I went back to the lawyer in Maryland, who understandably seems running out of patience, and he said that the best Maryland can produce is exemplified copies of all the original estate documents.
So I am caught between the Lebanese judge who is saying he needs a judge's confirmation of my mother being the sole heir, and the Maryland lawyer who says that is not how it's done.
My questions are: Is there a way to get the Orphan's Court in Maryland to confirm my mother as the sole heir? If not, is there any documentation or link I can send to the Lebanese judge to prove that the Letters of Administration are all he needs?
Any advice would be appreciated. Thank you very much.
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