I see you have posted on the Mormon forum, so you may get an answer there, but I did find this:
Do You Need a Temple Divorce to be Legally Divorced? No, when Mormons divorce they do not need to have a temple divorce first before they can be legally divorced. In fact, a civil divorce must occur first before a temple sealing will be canceled. (Local laws and Church procedures may be different in some countries.)
Mormons who have not been sealed in a temple but were only married civilly do not need to apply for a temple sealing cancellation as no sealing exists.