I phoned IG today, if it's any consolation they're not lending your shares out for short selling either. The only people selling GME right now are short sellers, selling shares they're borrowing for the third time, IG put a stop to that lending, as I am sure a lot of brokers are doing, whether they have shares to sell to retail or not.
Another way of looking at it, GME had ~250% short interest last I looked, that means there is something like negative 100 million shares available to buy right now, if you or I were selling, those shares will go towards getting the available shares back to zero, so there still wouldn't be any available to buy.
I expect NYSE will halt trading on GME some times this week, maybe tonight. They have to, the short sellers debt racking up is unpayable.