Thank you for contacting us and I'm sorry about the issue you are experiencing. There's no way to share or sync between two separate mSecure accounts. However, your husband can create a backup file and you can restore from that backup file if you'd simply like to start off with whatever information your husband currently has in his account. Here's a guide that shows you how to back and restore in mSecure 5 for iOS: https://support.msecure.com/en/support/solutions/articles/36000064291
Beyond that, if you would like to always keep everything in sync with the exact same mSecure information, you'd need to either continuously backup and restore or simply use the same mSecure account on all of your devices. However, please note that iCloud syncing also requires you use the same iCloud account so you would need to switch to a different sync option even if using the same mSecure account on all devices.
Please let me know if you have any other questions here.