Hi Rodney/Dev Team,
We are getting the same issue with Edge and Chrome Browsers where some sites work perfectly fine whereas some genarate HSTS failure message on the same machine with same proxy and decryption certificate.
We have deployed the certificate used in decryption using GPO and it is working for most of the sites.
Since you confirmed that the issue stands resolved after "once the cert was successfully imported", can you please confirm the location of the certificate being imported, as within browser settings or Certificates MMC or someplace else.
This issue is currently persistent with specific sites such as
bing.com, custom sites hosted in our infra and
accounts.google.com. Apart from these domain specifically the proxy is working fine for most of the other sites being accessed.
Regards
Techie.