The patch 7.1 notes mention:
"All perks that are triggered by a perfect parry will now also trigger from a perfect block (even if the description doesn’t mention it)."

However, after testing it across several operations, I can confirm that with the Bulwark, the Intimidation Aura perk is bugged.
The perk description says it only triggers on a perfect parry, but following the 7.1 patch, it should also trigger on a perfect block.
Nevertheless, it only works about 1 time out of 10.

As you can see on the screenshots, a perfect block triggered the perk "defensive adventage" creating a shock area, but nothing from intimidating aura