Keeper integration not working in Linux?

https://blog.devolutions.net/2019/08/video-new-remote-desktop-manager-integration-with-keeper/
We are using Keeper integration for our RDM enterprise environment, as we use Keeper as our password backend instead of secret server. However, it is not working on Linux:


calling freerdp_InitializeSSL
freerdp_InitializeSSL #1
freerdp_InitializeSSL #2
___freerdp_openssl_initialize #1
___freerdp_openssl_initialize #2
OPENSSL_VERSION_NUMBER: 0x1010104F
___freerdp_openssl_initialize #4
___freerdp_openssl_initialize #5
[14:13:04:259] [18141:18147] [INFO][com.freerdp.core] - freerdp_set_last_error resetting error state
[14:13:04:260] [18141:18147] [INFO][com.freerdp.core] - freerdp_set_last_error resetting error state
[14:13:04:287] [18141:18147] [INFO][com.freerdp.crypto] - creating directory /home/robwag/.freerdp
[14:13:04:287] [18141:18147] [INFO][com.freerdp.crypto] - creating directory [/home/robwag/.freerdp/certs]
[14:13:04:287] [18141:18147] [INFO][com.freerdp.crypto] - created directory [/home/robwag/.freerdp/server]
[14:13:24:808] [18141:18147] [ERROR][com.freerdp.core] - freerdp_set_last_error ERRCONNECT_NO_OR_MISSING_CREDENTIALS [0x0002001B]
[14:13:24:808] [18141:18147] [ERROR][com.freerdp.core.transport] - NLA begin failed

Instead, it prompts for credentials:

Any idea if this can be made to work? Are there any advanced loggings available as to why it cannot find these credentials on Linux?