Hey fam, glad to be here.

Anyone have any info on how to revoke mint authority on tokens?

Mint authority is only requested when you want to mint and terminated after wards, Tonconnect UI doesn't hold the wallet approval and use it again without your notice.

The common method is transferring that authority to "burn address". I don't remember which address of [null, 0:000...000, -1:000...000, 0:FFF...FFF, -1:FFF...FFF] is recognized as such.