Update:
asked my friend to KYC it's clear the account is not mine. He said KYC is taking an insane amount of time and asking for docs on docs but he's sending everything.
Lets see if they change their minds after he completes it successfully
If you can provide a reasonable explanation on why you tip each other, you might have a chance. Your KYC process is not the standard procedure since it’s a requirements for an investigation for a possible violation of ToS.
It’s a good sign the Shuffle entertain your request to reconsider your issue by providing KYC. Please keep us updated on the progress. I’m curious on how they will handle your issue because this multiple case never resulted on players favor. Wish you a good luck.
Since the amount involved is " $850" as per scam accusation made by him, I think that's worth submitting a KYC documents. Besides, if you trust the casino to take care of your documents, there should be no problem here, otherwise if you say no you'll lose that $850 that's already a lot of money.
Sometimes this things do trigger, but regardless, the casino can still ask a gambler to submit some documents for KYC purposes as that is part of the guideline they have being a regulated casino, so it's up to you (@odapoda ) and your friend if you'll comply or not.
However, since it's your friend is taking care of it now, the community would love to know the result of your effort.