U.S. Olympic legend Amy Van Dyken just got a full-fledged apology from the U.S. Postal Service -- after a USPS truck blocked her from parking in a disabled spot at her neurologist's office.
Amy -- who uses a wheelchair after suffering a spinal cord injury back in 2014 -- took video at the Barrow Neurological Institute in Phoenix ... showing a truck parked in the disabled space despite the fact there are BUNCH of other open spaces in the parking lot.
Now, we've learned the USPS has reached out to Amy to apologize calling the situation "absolutely unacceptable."
In fact, the USPS sent a statement to Van Dyken saying ... "The action documented in your video is against Postal Service policy and is absolutely not acceptable behavior."
"We sincerely apologize for your experience, and assure you we are looking into this situation to ensure it does not happen again in the future. Thank you for bringing this to our attention."
We spoke with Amy who tells us ... "I'm so thankful for their apology. It was amazing for them to reach out."