Cannot connect to OpenVPN server on GL-AX1800 (Flint)

GL-AX1800 Flint, firmware 4.5.0

The client with app version OpenVPN Connect 3.4.0 (latest, Android) cannot connect to router.
The following message is given.

Error message: You are using an insecure hash algorithm for the CA signature. Regenerate the CA certificate with a secure has algorithm.

The configuration is attached. What can be done more, there are no options to regenerate certificates in the router’s UI.