Intel has invested record levels of capital expenditure in their manufacturing, but it has not been enough to meet demands. Intel has stated that they will be contacting customers, partners, and distributors individually with more information and revised shipment schedules. Intel: Supply remains extremely tight in our PC business where we are operating with limited inventory buffers. This makes us less able to absorb the impact of any production variability, which we have experienced in the quarter. This has resulted in the shipment delays you are experiencing, which is creating significant challenges for your business.
Source: https://www.bleepingcomputer.com/news/hardware/intel-posts-letter-apologizing-for-continued-cpu-shortages/