Found this link on a MyVegas group.
Worked for me and when I logged on I also had a 50M credit as an apology for some technical glitch they had recently? YMMV on that part, if you play regularly I imagine you have already claimed that.
NOTE: Click this link on mobile device with MyVegas Slots app already installed and logged in/synced to your Facebook account.
Personally I don't play regularly. I log on every few weeks to ensure account stays active (although I've never heard of dormant accounts losing points).
From this little bonus I've added 10,000 "LP" which are more or less Vegas Dollars (1:1000ish) that can be redeemed for various rewards.
so ~$10 return?
Obviously your reward/kickback will vary depending on how nice the slots are to you.
Extra Huge YMMV: My app actually gave me the 50M bonus 3x... this likely is from various disbursements that I missed from not having the app for months....but YMMV maybe you'll be lucky too. Probably had to already be signed up/have previously had the app installed to be eligible, but I don't have multiple accounts to know.