You may want to report it to ST support, it may be a server outage for the new app. Consider using the Classic app SmartLocks (you have both installed simultaneously) until the new app is more stable.
Otherwise, if you want to use the new app (and if you have access to RBoy Apps) you can try using the Lock User Management (LUM) SmartApp for basic and advanced programming (which is compatible with SmartLocks)
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