As it is written, “God gave them a spirit of stupor, eyes that would not see and ears that would not hear, down to this very day.”
Romans 11:8 ESV

Paul paraphrases Isaiah 29:10 and Deuteronomy 29:4. Read the full context of Isaiah 29. The specific eyes and ears spoken of in that passage are those of the prophets and seers, not of the people themselves.

The same was true in the time of Yeshua and Paul. The teachers and spiritual leaders of the people were determined to follow their own way and force the Messiah to fit their mold, and so when he came, they didn’t recognize him. God reinforced their stupor to ensure that Yeshua would be rejected and crucified.