I have come across this error before, when upgrading PBIRS to a newer version. For me, the problem was the newer version of PBIRS was trying to create the URL reservations, but the previous version had not correctly released them (so they were still reserved). Without the URL reservations, PBIRS could not create the relevant certificate bindings.
List all the URL reservations held by SSRS or PBIRS:
# List all the URL reservations held by SSRS or PBIRS:
netsh HTTP show urlacl
netsh HTTP show urlacl | Select-String -Pattern "443"
# Manually deleted the unwanted (or old) URL reservation:
# eg. Reserved URL: https://servername.domain.com:443/Reports/
# then run:
delete urlacl url=https://servername.domain.com:443/Reports/