When using Service Account authentication in Google BigQuery connection Manager the following error is received.
Validating connectivity via endpoint '' failed. Details:Cannot find the requested object. (CozyRoc.SSISPlus.2019)Additional information:Cannot find the requested object. (mscorlib)
If you want to use "Service Account" authentication, you have to provide the key file in pfx (p12) format. You can refer to the following KB article to export the key file to .pfx.
How to export key pair and certificate to .pfx file.