My first (fractional) BTG was mined, soon after the Launch.
I’m glad your Coinomi experience was good! As staff, I try to stay neutral - but I think this is a great idea for a topic and I hope lots of people report in.
I also used Coinomi wallet to get my first BTG . I use my LTC and swapped it with Changelly in the wallet to get the BTG. No problems. I like the idea of the masses being able to mine BTG and not just the rich and powerful.
What type of wallet did you generate?
What error do you get?
Normally you should be able to import it into the official BTG Wallet (https://github.com/BTCGPU/BTCGPU/releases) using “importprivkey <YOUR_PRIVATE_KEY>” but this will take some time and disk space.