I have had a camellia bush for 8 years, 4 years in Charlotte, NC and I then moved to Myrtle Beach, SC. The result is the same: camellia has buds but they never open (for years).
Camellia Buds Don’t Open
Certified GKH Gardening Expert
Bud drop or buds not opening can be due to soil nutrients or even insects.
A soil test can help you determine what may be missing from the planting location.
Neem Oil is a good treatment if you suspect insects. Neem Oil is safe for people, pets and bees.
Here are some links to help you.