IMHO, along the lines of CA I'd use a formulation made for cementious landscaping retaining wall blocks which are IMO made for the brick and the mortar (alkalinity/chemical reaction??)

Other options are Gorilla-brand adhesive (urethane) which uses moisture in the air to cure it--be sure to clamp it as it does expand. Excess can be easily scraped off.

Or contact cement used for laminate counter tops. I experimentally installed a marble floor in my foyer directly over a non-sealed particle board floor 15 years ago and it has not cracked or delaminated. Note that contact cement won't require clamping--but you generally have one chance to install it--it grabs tenaciously upon contact. If you screw up simply drip lacquer thinner in the joints to soften it, let dry for a day or so and lightly recoat.

In either case if it were me I'd "let" or scrape the mortar the thickness of card stock (.003" to allow for the added thickness of the glue/cement/adhesive.

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