WBNB is not a bridged variant of BNB through the AllianceBridge, but a wrapped BEP20 version of BNB on the Binance Smart Chain network. To wrap BNB to WBNB, go to https://pancakeswap.finance/, and then on the menu on the left, click on "Trade" and then "Exchange". You then select BNB as "from" token and WBNB as "to" token. Once you have entered an amount, you can press the Wrap button and confirm the transaction in MetaMask."
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