Hello there @LeadingSumo9835!
There are multiple possible causes for this type of problem. Please make sure your mesh has non-overlapping lightmap UVs. Next, set your lightmap coordinates to 1, and check if your lightmap resolution is too low/high (best results are usually at 128). You could also test adding stationary lights to your scene, and see how they affect the baking.
Also, checking through the community, found a similar scenario, that was resolved in the following thread, please test their solutions implemented here: