OpenWeatherMap returns HTTP 401

[eLEn]

Hello,
I am using RadioBOSS 7.2.1.8.
OpenWeatherMap is selected as the weather source.
My API key is active and works outside RadioBOSS, but RadioBOSS reports:
Weather update error: HTTP error 401
I tested with different cities (Kozarac and Prijedor) and the result is the same.
Is there a known issue with OpenWeatherMap support in RadioBOSS 7.2.1.8?

Thank you.