iOS & Android Requirements
- The game was not installed previously on the device of the invitee.
- The invitee doesn't use VPN when accepting the invitation, installing the game, and playing.
- The invitee doesn't use any AdBlockers.
iOS Specific Requirements
The invitee should accept the "Allow to track" question when installing. Otherwise, the invitation will not be counted.
If the pop-up with the tracking request didn't show up, it might mean that this pop-up is disabled in the phone settings. In this case, tracking will be always rejected automatically, so the invite won't be counted either.
Your friend can check and enable tracking requests the following way: open Settings → Privacy → Tracking → Allow Apps to Request to Track. Please note that allowing tracking after your friend has installed the game for the first time will not help to receive the reward.