Withdraw fro Crypto.com to Hiro…need memo

Trying to withdraw from Crypto.com to Hiro wallet. The wallet says that no memo is needed but crypto.com will not let the transaction pass without a memo.
I tried without a memo and the transfer failed. Then, I tried using test in the memo field and it did not go through.
Anyone had that issue before? Is there a generic memo that can be used?

Just type in any number in the memo field and it should go through. It seems you cannot use letters. I typed in 222 when I withdrew from OkCoin to my Hiro wallet, and it went through. I typed in 212 when I made another withdrawal (just in case I accidentally stumbled on a universal memo) and that also went through.