Over 1 million Americans are still waiting for unemployment aid - The Washington Post

State unemployment offices are often saddled with decades-old computer systems that delay the implementation of new programs. Oregon was the last state in the nation to waive a one-week waiting period for benefits because it took seven months to reprogram their computer system.

Oregon, like many other states, uses a computer system based in a 1960s-era programming language called COBOL.
The latest relief package passed by Congress did not include any additional funding to help state unemployment offices upgrade their computers. An early proposal included $1 billion for such upgrades but that measure was scrapped from the final bill.
https://www.washingtonpost.com/business/2021/01/04/unemployment-never-recevied/