The question is whether your wallet is able to trigger that url.
– Did you restart the wallet?
– Is there a firewall in the middle blocking the call?
Perhaps you can try the curl command from the machine that runs the wallet and see if it works. Remove the silent (-s) argument to be able to see errors. So, you might try, from your wallet machine:
curl --verbose -k https://www.urcryptodepot.com/wallets/api3/notify/FCK/wallet/SOMETXID
and see if the command fails.