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Sun drives photosynthesis which allows morning glory to grow quickly. It will languish and sulk while in shade. There are degrees of shade, however. Deep dark shade is a problem. Bright shade, meaning no direct sunlight but lots of ambient light, may be OK temporarily. I would not be surprised if the lower leaves yellowed and dropped after several weeks in shade.

It appears you may have a few issues; both pest damage and perhaps some fungus issues.
Growing the same plant in the same soil for multiple years can lead to fungus diseases.
You can try treating with Neem Oil.
You may want to replace the soil for planting with new soil and even do crop rotation.
Remove any leaves that have fallen and discard; do not compost.
Avoid overhead watering and increase air circulation in the area if possible.

https://www.gardeningknowhow.com/ornamental/vines/morning-glory/morning-glory-diseases.htm

It is likely that there is an infection in the soil. I recommend applying wettable sulfur and dolomitic lime around them. This will take care of the issue, and recondition the soil at the same time. This article will help with the care of these plants: https://www.gardeningknowhow.com/ornamental/vines/morning-glory/growing-morning-glories.htm

Make sure your containers have drainage holes and that the excess moisture can drain freely from the potting mix.

I would suggest starting over with new seeds.
This article will help you.

https://www.gardeningknowhow.com/ornamental/vines/morning-glory/growing-morning-glories.htm

Your morning glories will grow without fertilizer, but will produce more flowers and grow larger if you fertilize them monthly during the growing season. Choose an all-purpose fertilizer with equal amounts of nitrogen, phosphorus and potassium, indicated by a ratio on the label, such as 10-10-10.

https://www.gardeningknowhow.com/ornamental/vines/morning-glory/growing-morning-glories.htm

The active ingredients in the product you sprayed are potent broadleaf plant killers with systemic action that kills the roots also. You may have made a fatal mistake, and there is not much you can do except wait and see.

Be aware that this type of product is hazardous to trees and shrubs that have their root systems extending into the lawn or planting beds that you treat. The herbicide can be taken up by the roots and cause discoloration, leaf distortion, or even die-back and mortality.