ContributionsMost RecentMost LikesSolutionsRe: EXO Payroll - STP Submission Failed - Status Code 403 All good after the deletion of expired certificate. Thanks Roselyn !!! Re: EXO Payroll - STP Submission Failed - Status Code 403 . Encountering same issue today. I've checked the certificate and it was expired. Expiration date 06/04/2024. If I remove the expired certificate, does it fix the problem?