hmmm I was able to do it few days ago, as mentioned above I used GOLD - ETH market because GOLD - BTC was also not available for me

also try to switch off VPN I have seen that it caused also problems and I have seen "market not available" error message on GOLD-ETH too when I tried to use Marketplace with VPN switched on

don't know if that was the problem but as mentioned I was able to sell GOLD, it took longer as usual, I had to wait several hours for ETH to arrive to my wallet but it was because network was very busy at that time as I have heard from Digital GOLD support agent

If you have problem with Digital GOLD Marketplace write to support using contact form on the website, they are very responsive and for sure will help you, here link:

https://gold.storage/en/support