Transmuter says NBXplorer is not configured but it is

[Kixunil]

After installing and accessing NBXplorer status page I get "not configured" error with this config info:

 {"Uri":"http://127.0.0.1:24447","NetworkType":2,"CookieFile":"/var/lib/nbxplorer-regtest/RegTest/.cookie","UseDefaultCookie":false,"Cryptos":["BTC"]}

This is completely correct. That URL can be accessed (e.g. using wget), NetworkType 2 - regtest is correct, CookieFile points to existing file that can be accessed by the user running transmuter (sudo -u USERNAME cat var/lib/nbxplorer-regtest/RegTest/.cookie works)
DefaultCookie is obviously not needed and only BTC is enabled.

Log

Feb 04 21:05:24 disp9064 btc-transmuter[8234]: warn: BtcTransmuter.Extension.NBXplorer.HostedServices.NBXplorerHostedService[0]
Feb 04 21:05:24 disp9064 btc-transmuter[8234]:       Starting up listening to BTC
Feb 04 21:05:24 disp9064 btc-transmuter[8234]: warn: BtcTransmuter.Extension.NBXplorer.Services.NBXplorerClientProvider[0]
Feb 04 21:05:24 disp9064 btc-transmuter[8234]:       Creating NBXplorer Client BTC
Feb 04 21:05:24 disp9064 btc-transmuter[8234]: warn: BtcTransmuter.Extension.NBXplorer.Services.NBXplorerClientProvider[0]
Feb 04 21:05:24 disp9064 btc-transmuter[8234]:       Connecting to NBXplorer @http://127.0.0.1:24447/ with auth cookie /var/lib/nbxplorer-regtest/RegTest/.cookie
Feb 04 21:05:24 disp9064 btc-transmuter[8234]: info: BtcTransmuter.Extension.Timer.HostedServices.TimerHostedService[0]
Feb 04 21:05:24 disp9064 btc-transmuter[8234]:       Starting Timer Service
Feb 04 21:05:24 disp9064 btc-transmuter[8234]: info: BtcTransmuter.Services.TriggerDispatcher[0]
Feb 04 21:05:24 disp9064 btc-transmuter[8234]:       Trigger being dispatched: BtcTransmuter.Extension.Timer.Triggers.Timer.TimerTrigger
Feb 04 21:05:24 disp9064 btc-transmuter[8234]: info: BtcTransmuter.Services.TriggerDispatcher[0]
Feb 04 21:05:24 disp9064 btc-transmuter[8234]:       0 possible recipes to be triggered by BtcTransmuter.Extension.Timer.Triggers.Timer.TimerTrigger
Feb 04 21:05:24 disp9064 btc-transmuter[8234]: info: BtcTransmuter.Services.TriggerDispatcher[0]
Feb 04 21:05:24 disp9064 btc-transmuter[8234]:       BtcTransmuter.Extension.Timer.Triggers.Timer.TimerTrigger triggered 0/0 recipes
Feb 04 21:05:24 disp9064 btc-transmuter[8234]: Hosting environment: Production
Feb 04 21:05:24 disp9064 btc-transmuter[8234]: Content root path: /usr/lib/BtcTransmuter