Businesses buy computers for the software and the Amiga did not have Lotus 123, MS Word, Multiplan, or Excel.
Microsoft after a certain point stopped supporting niche platforms. I had Flight Simulator and Multiplan on the C64, for example. The Amiga did not have either.
The Amiga did eventually find a niche where it was known to be the best solution but it wasn't a large enough market.
https://arstechnica.com/gadgets/2016/03/a-history-of-the-ami...