Not able to send BTC on BNB Smart Chain

Hi, I have an amount of BTC on BNB Smart Chain, but I am not able to send them anywhere. Is this currency a valid and effective one?
I tried to transfer to my wallet BNB and also to convert BNB into BTCB, looking to have the needed gas fees to do a transaction. But no matter what, I am not able to send the BTC e.g. to my Crypto.com wallet.
The error I get is “Not a valid ETH address” in this specific case.
Can someone help me understand what is wrong or what I should do to send them?