We had the same thing happen to us. We knew it was a topical epoxy sealer and tested it, with no problems. Once we started cleaning in the traffic areas the epoxy came off in strips! It turned out that they had put the epoxy down, Instead cleaning it and of course it didn’t stick!
The fix, that we had. She still had some original product, Aqua mix grout colorant, So we ordered new and applied it for her. This stuff is like paint covered old as well as new, the prep did suck a little but it got done, she was thrilled, and we kept moving.
In the future the testing will be a little more intensive because it would have been avoidable if we had tested in the traffic areas.
Tony