Hi fjosediaz30,
What happens when you remove the lock and add it back again?
You can find these steps along with other information that may be helpful, here: Unlock your door with a home key on iPhone – Apple Support
If you have followed the steps correctly and you still have the issue, let us know if you get any new alerts or error messages when trying, as those may help us determine what might be causing the issue.
We also recommend restarting your devices and keeping them updated as those steps assure you have cleared out any minor software issues and are running the most current version.
Update your Apple Watch - Apple Support
Update your iPhone or iPad - Apple Support
Update your Apple TV - Apple Support
If you still have questions, reach out to Apple Support directly, as this may require closer guidance: Get Support
Cheers!