They are not interested in solving your problem. The purpose of not providing any support after blocking the account is that they will continue to operate in this way. As far as research has been done on them their reputation is not good, they are actually running this website to scam gamblers. So it is not right for any gambler to expect anything good from them.

https://www.trustpilot.com/review/bit555.io

It's not the friend who has had their funds locked, it's OP. The alleged friend tipped OP, later asked to get the money back. When OP tried to send the tip back, his account was already locked.

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it's weird that the site asks you to reset the password when that's exactly what you are trying to do (hopefully).
One of the images states that there is a security risk with your account of some sorts. Perhaps a weak password, no 2FA, etc. Did the casino send you any email after you clicked on the reset password button or are there any other emails from them? Some casinos, for example, require having 2FA active for withdrawals. 

When you click the "reset password" button, the message above the screen popped up and didn't redirect you to a password resetting request page?

Have you tried telling your friend to ask for reversal from his side?

That is what I initially thought, few years ago someone tried to scam me with an almost similar method, a stranger contacting me because he knew me from one TG group, asked my help to withdraw from a website and he'll pay me some percentage for the trouble. I knew right away he's a scammer but decided to see how far he'll go, so I made a disposable email, created an account with it, and he transferred the fund to my account through the tipping feature on the site so I can WD it for us. The catch was, in order to WD from that account, I had to deposit some amount of ETH.

Long story short, I toyed with him a little until he met his boiling point and stopped the chat. Pretty much sure the website was his because he asked me to transfer the fund back to his account and when I said I've did it, he knew I hadn't because he still can see the amount on my account.

What differentiate mine from OP's is that I need to deposit in order to WD while OP got his WD feature blocked.

This is why I bombarded him with questions yesterday. In the end, I decided to gave OP benefit of doubts and believing that his story is real and his friend is also a real close friend. [There are several other possible scenarios on my mind, but let's just table it] For this situation, best they can do is what I said on my previous post, for his friend to contact the platform and ask for reversal himself.

I'd really appreciate if OP can sbow us the screenshot of the error message saying his account is blocked, though.

Try to reset the password and then log in into your account. As holydarkness pointed out, you haven't entered the correct verification code.
How good of a friend is that online friend of yours? Some people are too fast to call strangers friends.

Let me give you an example of how such a scam could potentially work if your friend is part of the group of scammers.

1. Your "friend" gives you a tip.
2. He then asks you to give it back for whatever reason.
3. In the meantime, the casino blocks your account and doesn't allow you to send the money back.
4. Your friend pressures you to give him his money because he needs it.
5. Since you can't send back the tip, he might suggest you pay him from your personal wallet.
6. Eventually you give in and send him the $150 you owe him.
7. Your friend and the casino just made $150 from you.

I fixed your post format so people can understand them better.

Point number 1-4 is just so I can understand the situation better and didn't misunderstand what actually happened. Point number 5 is to figure out a way to solve the problem.

As your account is blocked for withdrawal and the fund itself is not being confiscated, and his account is working perfectly, and he asked the tips back, can't you just send the fund back through the very same feature of tipping?

Maybe we're lost in translation and the long sentences without comma. Let's start from the beginning, please answer me with simple yes or no for each questions:

1. Were your account newly created just for the sake of receiving the tip? No
2. This friend who tipped you, is a close friend and not a stranger on DM? Is a an online friend
3. Was the tip sent by your friend is the first one he sent through the platform? No
4. Up to the time this discussion happened, your friend's account is fine and working, only your account that is blocked for withdrawal? Yes

For point number 5, it is not a yes/no question, but please help me understand by keep the answer simple,

5. The tip your friend give to you, is it through a deposit to your account or through a tipping/transfer/p2p feature on the site? Tip on the site feature

So you created an account on the casino --which already have a very bad rating-- just for the tip, and your friend's account itself on the site is completely fine and working, not banned or whatever? And they asked the money back right after sending it? In my custom it's considered as something rude, but I think that's to each of their own. One more thing, if you don't mind, how close you are with this friend and how frequent are they sending you a tip? Certainly they're not just a stranger DMing you saying they need to withdraw their fund from the site but got blocked for whatever reason and reached you to transfer the fund to your account so you can withdraw it for them for some charge that you can keep?

I don't think I understand correctly, your friend tipped you 150$ on this site, so you created an account in order for them to be able to tip you, the deposit entered your account, and later, they changed their mind about tipping and asked you to withdraw because they needed the money back?

kind of weird that the only way of contacting them outside the casino is through telegram. being a casino I at least expected them to have a dedicated email for their support. you should try contacting them through their telegram you they might answer you there. just curious, have you deposited at this casino before? if you haven't based on the thread Oshosondy shared they might ask you to deposit money first before being allowed to withdraw.

Do you know this friend personally or they just slided on your DMs one day?

Asking because this look like the typical scam DM attempt where people are redirected to some shady website to withdraw. It's likely that you will be asked to KYC and/or deposit money to withdraw. Make sure to never comply to any of these because they are known scam scheme.