I am also using the Huawei P20 Pro and Auto Unlock and Smart Notifications work for me without problems with the following settings:
And don’t forget to check your battery saving settings:
If you still got problems after checking that (or already got those settings) please send a log-file with a short description of the problem and the exact time when it occured to our support team at contact@nuki.io, so they can check the details of what happend.
This is focused on developer related issues.