How To Activate a Credential when receiving this error message: Access Denied-Query and validate field mismatch
The error on the access credentials was due to a mismatch between the time on the board and the time the credential was listed as active. I.E. if the board thinks it's 12:30pm, but the credential is scheduled to be active starting at 12:40pm, it will throw an error because of the mismatch until the time on the board matches the initial valid start time. To avoid this in the future, you can just set the active time to be 1 day prior to the current day, that way the credential is recognized as immediately active.