Hi, need more screenshot as to what exactly we are looking at. Its too dark to see whats going on. Is it one whole wall mesh or its in pieces? Seams can happen for a number of reasons. Try showing us the lightmap UVs and mesh wireframe that would help me to better judge whats causing this issue, also post screenshot of UV charts that Unity make during lightbake.
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Is it one whole wall mesh or its in pieces? Seams can happen for a number of reasons. Try showing us the lightmap UVs and mesh wireframe that would help me to better judge whats causing this issue, also post screenshot of UV charts that Unity make during lightbake.