@Ciderboy 
It is recommended to  factory reset bulb and see if Bulb will flash other colors or could be set on a different color? 

Factory reset :  https://www.tp-link.com/support/faq/2753/

Try to set a different color like Blue/ Red,  every color does not work and bulb goes off? 

Can you share the MAC address of bulb to us via private message, thank you. 

@Ciderboy Hello,

Thanks so much for sharing all the detailed info, the certain bulb could be defective, we would like to have a specialist look into this further via email to start the warranty process.Please check your mailbox later.Thank you!