Unable to verify contract on Binance smart chain testnet (BSC testnet)

Hi, welcome! :wave:

Sorry, I am not familiar with the BSC-Chain, maybe you should ask for help in their forum: Home | Binance Chain Forum

And they have a documentation about how to verify contracts, maybe you can have a look at it:

And if you deployed your contract with the Remix, you can have a look at this tutorial: Verify erc20 token on etherscan that was deployed through remix:step by step guide

For next time, please have a search in the forum at first and then ask questions, thanks!