Many people who are Hypo find it virtually if not totally impossible to lose weight until they get their thyroid levels correct. My wife being one of those people.
Weight lose is almost never simple. While some can take thyroid hormone and lose weight, most do not by the medication alone. However once the metabolism is starting to get under control with the proper amount ouf thyroid, the diet and excercise starts to become effective, while doing those things without the thyroid balance is virtually worthless for many people.
Please post your recent thyroid labs with reference ranges, which vary lab to lab and have to come from your own lab report. If you can't lose weight, meds are likely not adjusted properly. Do you have other lingering hypo symptoms?
What do you take for meds?