Please let me know if this isn't allowed. I can show proof also.
This is allowed, but you are being scammed.
NO legit business will ask you to deposit money when they already have it in your account.
Sadly I will say agaisnt you. There are so many of them, but let's say not the same case as this one.
For getting a bonus of registration on some national exchanges you get a specific bonus, but that one becomes available once you deposit.
Why it is isn't related to the topic? Because this is basically as a requirement agaisnt KYC which is ridiculous. But as I said, I got the same PM from someone last night about 0.001 btc. Probably some low scammer that needs disperately money.