Many people are under the misconception that it is the credit bureaus that collect information about consumer from various creditors. In fact, the contrary is true. It is the creditor who supplies the information to the credit agencies about their consumers. The fair credit reporting act gives every creditor the choice to report or not report financial data about its consumers. Even so every creditor has the freedom to either provide information to all three national credit bureaus, namely Equifax, TransUnion and Experian, or to just one of them.
The majority of major credit providing services like credit cards and personal loans do provide information on their consumers to the credit bureaus.
However, if you find that one of your accounts is not listed on the credit report then it is possible that your creditor is not report to the particular credit bureau. There is nothing that credit bureau can do to include an account on the report that has not been reported by the creditor. Because of this filing a request or dispute with the credit bureau is not going to work.
There are other reasons due to which a particular account may be temporarily taken off credit report such as technical issues which is rare. Another instance where an account may not appear on the credit report is if there is a merger taking place between two companies. The account can be removed at the behest of the companies until the records and functioning of the businesses are successfully cohered. In this instance the record of account is automatically restored once the records of the companies are up-to-date.
You can always check with the creditor concerned whether he reports to any credit bureau not.