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You may be lacking phosphorus. If there is a lack of phosphorus in the soil, plants will have little to no blooms. You can either use a phosphorus rich fertilizer or add some bone meal to the soil. These articles may help as well: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm

The growing conditions would be the same, though you may want to give the shrub a bit more afternoon shade in much warmer climates. Also, allow more spacing between plantings to encourage airflow and avoid fungal issues. This article will also help: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/growing-hydrangeas-hydrangea-care-guide.htm

It is likely lacking a good phosphorus/nitrogen balance in the soil. Too much nitrogen or too little phosphorus will cause it to fail to bloom or reduce its flowering potential. This article will have some other suggestions as well:
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm

Hydrangea colors are based on nutrients in the soil. This article will explain more: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/change-hydrangea-color.htm

This was likely caused by sun scorch, but it will not hurt to treat the shrub with neem oil, which is an effective fungicide, just to be safe.

It sounds like you need some ventiliation holes in the bag, as there is too much moisture. Carefully poke a few holes in the bag to allow for some air flow. You only need the bag while the cuttings are forming roots. Once they have some root growth, you may remove the bag for good. To check for root growth, lift the bag so that you may lightly tug at the cutting. If there is resistance, then it has formed roots. If it comes out of the soil fairly easy, replace the bag over top as it needs more time.