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Here is a link with more information for you.
https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-plant-doesnt-bloom.htm

It could be a lack of maturity or other issues. The links below will help you optimize it's growing conditions.

https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-plant-doesnt-bloom.htm
https://www.gardeningknowhow.com/ornamental/foliage/yucca/caring-for-and-landscaping-with-yuccas-outdoors.htm

Usually yellow blades are a result of over-watering or not enough light, but this article may help you narrow it down (and also provides a helpful hint on removing any pests on the blades):

https://www.gardeningknowhow.com/ornamental/foliage/yucca/yellow-yucca-leaves.htm

Your plant is likely stressed from going from an indoor location to an outdoor planting.
Make sure the soil is well draining.

Here are some links to refresh you on the care requirements.

https://www.gardeningknowhow.com/ornamental/foliage/yucca/caring-for-and-landscaping-with-yuccas-outdoors.htm
https://www.gardeningknowhow.com/ornamental/foliage/yucca/growing-yucca-indoors.htm
https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-turning-brown.htm

If these are new plantings, and the leaves are turning brown, it is most likely too much water for your drought tolerant plants.

Water with a slow trickle of water at the base of the plant to avoid fungus issues.

Water every two to three weeks in the first growing season, once a week if it is showing signs of water distress during a hot spell.

The plant should receive 1 to 2 gallons of water each watering.

That is a soap yucca. It is definitly growing flowers! They do better when shielded from harsh winds. Just make sure to cut the flowering stems back when they start to seed or you're going to have a lot of yucca around. They produce a lot of seeds.