Issue with adding & trading IPO shares on listing day

I have been allotted 16shares of GIC Re. But on the listing day, I could not buy/sell before 3pm through holdings option. Even typing the share’s name in marketwatch didn’t return any results. I tried trading on web platform, there also marketwatch/holdings couldn’t be fetch. I had similar experience while adding MAS Financial & ICICI lomabard on their respective listing day. Why there is so much trouble to add/trade equity on listing day?

Both the queries - how to add IPO scrip to marketwatch on the listing date and how to see IPO allotted shares on listing date, are answered in link below.