Paint peeling from fireplace patch

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New Member
Nov 14, 2021
Suffolk VA
We're converting to gas and so I had my fireplace inspected. The gentleman patched a couple of spots in the fireplace with a grey unknown to me product. We have since painted it with black high heat oil paint. The paint did not adhere to the patched area.

Thought I would come here because I'm sure someone has experienced this at some point. Is there a product I could prep it with and repaint? a primer? Would I need to sand off the surface of the brick to paint over? Thank for reading!
How long ago was the patch done? If the patched area was filled with mortar then it could still be drying out. Normally latex paint would be used in this application.