How did that pass the drug FDA phases?

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Did the Pfizer COVID-19 vaccine really pass FDA trials?

https://www.bloomberg.com/news/articles/2021-01-15/norway-warns-of-vaccination-risks-for-sick-patients-over-80

Norwegian officials said 23 people had died in the country a short time after receiving their first dose of the vaccine. Of those deaths, 13 have been autopsied, with the results suggesting that common side effects may have contributed to severe reactions in frail, elderly people, according to the Norwegian Medicines Agency.

https://www.cnbc.com/2021/01/15/pfizer-to-temporarily-reduce-covid-vaccine-deliveries-to-europe.html

That's how Pfizer responded.