AWS SES Email address is not verified. The following identities failed the check in region AP-SOUTH-1

Hi, Domain status is verified in SES and still I see the error message rejected and email address is not verified. It works until mid November 2023 and there after we are facing issue with email rejected. could you please help me on this? currently SES in the sandbox and we don't want to move out from sandbox or request to production mode. how can the above issue can resolve with in sandbox?