Let me find out what the problem might be. 
Thanks icopress, but it is no longer necessary.I was in contact with support and we were able to complete the withdrawal successfully, although via TRC-20 and not via SOL or BNB. Whale is taking a closer look at this problem and why the withdrawal is not possible via these two chains.
I have to explicitly praise the support here again. The communication was extremely friendly, he got back to me immediately and actively supported me in solving the problem. That's exactly what you expect as a customer, really great!
Well that's good to know, one thing about a good casino is the customer support, once the support chat of the casino is up and active there is always hope of issue getting resolved and it eases the pressure of the complaining customer because nothing gets more irritating than knowing you are having issues but can't find anyone to respond or even the response is a form of delayed tactics. Well kudos to whales team