What @JDRoberts said about the name 
Three way light switches don’t actually dim anything - the switch energizes separate rings on the bulb socket depending on the way the switch is thrown. IF your non-3-way bulb’s socket is setup correctly you basically just have a switch that’s OFF-ON-ON as far as the lamp is concerned.
With a Smart Bulb, to ensure proper operation the bulb should always be powered. So your three way should be in one of the two ON positions - doesn’t matter which one. Just keep it there, break off the switch if you have to.
NOW, assuming you’re using it that way (leave it on all the time) what else can be the issue.
I tossed all my Osram bulbs because they were horrible at staying on the Zigbee network and they’re bad repeaters - other devices I had that repeated through them also had issues staying on the network… The only way I could make them SOMEWHAT reliable was to ensure I had Secure rejoin TURNED OFF on the hub and also put a reliable Zigbee repeater very close to the bulb. But after a year, I got tired of fighting them and replaced them all with Sengleds.