You can only apply for an administrative review if your decision letter from the Home Office explicitly states so. Furthermore, you must believe that your decision was refused due to a case working error - you cannot just apply for an administrative review because you disagree with the outcome. Examples of ‘case working error’ include:
The decision to refuse or cancel entry clearance or leave to enter or remain based on false representations, false documents or information, failure to disclose material factors or previous breach of conditions was incorrect.
The decision to refuse an application on the basis that the date of the application was beyond any time limit in the Immigration Rules was incorrect.
The decision maker applied the Rules incorrectly.
The decision maker didn’t apply the relevant policy or guidance.
There’s been an error in calculating the correct period or conditions of immigration leave.
Not anyone can apply for an administrative review because not every immigration application will be eligible to request one. You can only apply for an administrative review if your Home Office decision letter states that you can and if you meet the eligibility requirements.
If you are eligible to request an administrative review then your Home Office decision letter will issue you with instructions on how you can start the process and the time limits within which you must apply.
When applying to request an administrative review, you must refer to the reasons for your refusal and state why you believe that a mistake or error in law has been made. Once you have made your arguments and completed your application, you must send your application by email, post, or in-person (your refusal letter will state which method you must follow).
The time limit to submit an administrative review application typically ranges from 14 to 28 days from the date of receiving the Home Office decision letter.
The exact time limit is dependent on whether you are making an in-country or out-country application.
The Home Office aims to make a decision within 28 days of an administrative review application being submitted.