If manual troubleshooting fails, you should contact official support to verify your key's status or request a reset:
A common trick is to paste the key into your browser's address bar first to "sanitize" it of any hidden formatting before copying it back into the AirMyPC registration box. airmypc registration key fixed
Download AirMyPC | Airplay for PC Mirroring client If manual troubleshooting fails, you should contact official
Confirm you are using the key for the correct software version. Registration keys are often version-specific; a key for an older version may not work with the latest v7.2 release . Official Support Channels If manual troubleshooting fails