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According to this discussion:
If you have a HK visit visa, then it depends upon if your visa is single entry or multiple entry. If multiple entry, you should be fine. If single entry, then you should plan for Macau at the end of your trip, so that you can plan to fly out of Macau international airport, or take the ferry from Macau to Skypier at HK International Airport for your outgoing flight so that you don't need to go through HK immigration again
Assuming you did not get a PAR (pre arrival registration) visa, you will need a multi-entry visa (which you did not obtain unfortunately!).
You should adjust your travel plans accordingly. If you want to visit Macau, you can, but you cannot re-enter Hong Kong, so maybe travel to Macau at the end of your HK trip and return to India from Macau.