The Queen's cause of death is being "kept secret" by Scottish authorities.
Media outlets have repeatedly requested a copy of the monarch's death certificate from the National Records of Scotland (NRS).
If the Queen had died in England, there would be no need to release an official cause of death because the Registration Act of 1836 does not apply to monarchs.
As she died in Scotland, all deaths must be registered within seven days under the Registration of Births, Deaths and Marriages (Scotland) Act of 1965, including the submission of a death certificate to a registrar.
The document, which is a matter of public record, would usually state details - including the cause of the Queen's death alongside where and when she died.
But, despite inquiries about her death being referred to the NRS, the public body is understood to have told council staff not to release any details to media organisations, reports the Daily Star.
On September 16, an NRS press officer said no comment will be made during the Royal Mourning period, which ended at 8am on Tuesday, September 27.
After the period came to an end, the Government department said: "As you are aware, NRS has been unable to provide you with an update during the Royal Mourning period.
"We can now confirm the death of Her Majesty The Queen was registered in Aberdeenshire on September 16 and an extract will be made available in due course."
However, when asked for the date of release and why it would only be an extract, a spokesperson said they will be in contact directly "as soon as arrangements are confirmed".
Buckingham Palace is understood to have been unaware of the situation on the Queen's death certificate being withheld..
The monarch passed away "peacefully" at the age of 96 while surrounded by family at her beloved Balmoral estate on September 8.
The announcement was made at 6.30pm, in a statement saying: "The Queen died peacefully at Balmoral this afternoon.
"The King and The Queen Consort will remain at Balmoral this evening and will return to London tomorrow."
While national mourning ended on September 19 after the late monarch was laid to rest, the Royal Family continued to mourn officially for another seven days.
Now that period has come to an end, royal duties will resume once again with King Charles III, Queen Consort Camilla and other members of the family adjusting to their new roles.
While the King has already toured the four nations of the UK in the week after his mother's death, many more tours across the country are expected.
This will give members of the public outside of London a chance to meet the Royal Family members in their new roles.
There will also be a state visit in the pipeline, and it's predicted that the first big royal tour outside the country will be Charles heading to France "as soon as next month".
