When the energy saving is automatic then could this be a reason for a not correct working Ring to Open… For example, at the beginning of the Nuki App it was very difficult to get Huawei devices working together with Nuki (Android 8 & 9) but it seems they did fix this problem.
The energy saving need to be Manuel and all three sliders to on. This setting & and the Geofence up to 200m should fix your problem 
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