Without more information about the specific error message or code being used, it's difficult to provide a specific solution. However, here are some general troubleshooting steps that may help:
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Verify that the recovery code is being entered correctly. It's possible that there is a typo or other mistake in the code.
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Check that the recovery code is still valid. Some systems may invalidate recovery codes after they have been used once, or after a certain amount of time has passed.
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Make sure that the recovery code is being used in the correct context. Depending on the implementation, recovery codes may only be valid for certain types of authentication attempts (e.g. logging in from a new device).
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Check the server-side code that handles the authentication and recovery process. There may be a bug or misconfiguration that is causing the issue.
If none of these steps resolve the issue, it may be necessary to provide more information or seek help from a developer with experience in the specific technology stack being used.