@Chardz: Can you check to see if there is anything blocking the left earbud? To double check this, please remove the eartip from the right bud > Clean the sensor, mesh and eartip with a clean cloth > Clean the receiver with a cotton swab and dry brush to remove any foreign material > Reattach the eartip. Can you also open the Galaxy Wearables app, tap Find My Earbuds and select the magnifying glass symbol. Both buds will start beeping. Is the sound balanced in both earbuds? Please don't perform the above action while wearing the Buds, as the beeping can be quite loud. For further troubleshooting steps, please check out the link below.
Is the Bud showing as connected in the Galaxy Wearable app? If not, please can you also try placing the affected bud in the charging case by itself, and check the LED indicator. If it turns red, then immediately green, remove the Bud and repeat the process until the indicator turns red, and remains red, then check the connection status again.