Thanks for quick response.
I am doing site development on local environment so unfortunately it’s not possible to provide URL at this point.
I can only say that AMP is perfectly OK with TwentyTwenty theme even on local environment but not with Refined News.
Also, I am using the “official” AMP plugin created by AMP Project Contributors.
Since you confirmed that it’s OK at your end, let me dig more here. Probably related to my customization somehow.