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Sounds like that person you tipped haven't done any kyc? Maybe if he/she did it, they might believe you are 2 different persons.
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The user is limited on sports betting for a reason while the connected account received a tip from this user and continue the bet which makes me side to the casino on how they handle this issue.
And of course they will investigate further, as it's their job to double check everything. Everyone knows that there are ways to fake identities or steal identities, but that can take time, especially when it's about specific country. So not complying instantly is just more suspicious.
And there of course are official legal ways to approach this if odapoda and a friend are legit.
Maybe the issue is they can't provide it since maybe he is caught off guard with that and find that his case is true. But if he can able to provide what they have been asked him to do then I think everything is fine. At this point he does not have a choice but to comply on the investigation happen since if he insist to give what has been asked then that means the claims of this casino is legitimate and the guy is doing something shady which is against on the TOS of the casino.
At this point there's no excuse for people not to know about multi accounting restriction since for sure for a lot of discussions happened here or anywhere for sure that they know multi-accounting is not allowed on any casino.