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Thank you, perhaps I've missed them. I have added the contract address of POLYCUB and XPolycub on my wallet but the amount of locked vexPoly is not showing up (both on Metamask and on XDEFI) so I'm stuck on how to burn them.

if you go to your wallet address on polygonscan, then go to tokens and search vexpolycub you’ll find the token address

Add that address to your tokens and then send to 0xdead address

Found it, thank you lots! You're awesome!🫡🫡