Was the DAI sent on BSC/a BEP-20 token or was it an ERC-20 token and sent to BSC network?
Do you have the transaction hash to share?
Your address on eth and bsc are the same but the networks are totally different. You’d have to use a bridge to transfer between the two but if you are only transferring on one of them (i.e. bsc to bsc) that is ok.