I have made my episode(s) about tipping:
https://tapastic.com/episode/549221 (en)
https://tapastic.com/episode/550062 (es)
@agentfink
My husband had the feature and watched a video and tipped, and when I went to my phone, nothing.
But are you using the same phone and/or your tapas account in both?
I ask you just because as far as I know (or I think "I know"...), the amount of ads that you can see could is limited to every single account.
So if he's using your user to get the free tapacoins, he had reach the limit of ads, so you get the message "no more videos available"
In other hand, if you are using different users in the same phone, the app still has a limited number of ads per day (or something of that kind). This is a "maybe", but I have discovered this issue because, to make the screenshoots for my episode, I created a new user to tip myself, but due I've already spend all my video-ads in my main account, so even with that new user the app showed my the "no more video" message.