Efflorescence is caused by water wick up

Efflorescence or water stains along the masonry mortars are notice, they are from soil grade to more than one and half inches high above grade. The water wicked up from damp soil rises though block mortar by capillary action.
Is it necessary to apply mortar coat on the block surface and damp-proofing material on the outside surface under soil?

That is not the only thing, nor the complete story to visible effloresce but is a nice start.

Oh, and welcome, welcome, welcome!

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Efflorescence, a stubborn problem, caused by soluble salts in masonry, since the first time it
appeared thousands of years ago on ancient masonry walls.

Solutions: Potential efflorescent can be greatly reduced by using low alkali cements, clean washed sands and ‘clean, potable salt free water.’

Efflorescence: Cause and Control

Observations: Foundation: Efflorescence build up on CMU masonry bed, butt and head mortar joints.
Light Building bloom.
Poorly finished brick veneer bed, butt and head joint tooling.
Recommend: A licensed masonry installation and service contractor:
1: Clean CMU foundation building bloom and efflorescence.
2: Parge coat the CMU wall to prevent repeat broadcasting of bed, butt and head efflorescence and to allow a uniform surface throughout the foundation.
3: Assess and improve any degraded or poorly finished brick masonry bed, butt and head joints.
Act upon any referrals offered.

I don’t see a mortar joint in between those blocks and weep holes at bottom of brick wall…

And that weatherhood is improper for the dryer, and is clogged.

I see a bunch of mortar joints. Not directly. There is a layer of stucco covering the CMU’s.

The brick bed, butt and head mortar is in questionable condition. For one, the joints are recessed. This type of mortar finish style has been banned using clay brick in Quebec sense 1981.
The mortar has shrunk. you can see mortar bond loss at head & butt joints.

Morning, Bert.
Hope this post finds you well.

The CMU mortar bed, butt and head joints have not been tooled. The joints are flush and have not been struck or ironed.
Masons use mortar joint finishing tools. Pressure is applied to the surface of the mortar bonding the mortar to all sides of adjoining CMU surfaces sealing the bed, butt and head joint.

Look closely. You can see mortar bond loss, referred to as mortar cracks, at bed, butt and head joints.
The foundation system will under preform leading to premature failure unless certain steps are taken to prevent premature failure. Parging the wall would be beneficial.