Browsers show 4xx errors when there is a client side issue while browsing a website. 403 error specifically translates to “Forbidden“. Check Failed Request Logs and IIS logs to get more details about the issue. If you see 16 as a sub-status code, it means the underlying reason is that “Client certificate is untrusted or invalid” (Reference).
In the case I worked on, the issue was the missing root certificate in IIS server. We solved the issue by adding the certificate following the steps below.
Another root cause of the 403.16 issue might be the usage of non-self-signed certificates in “Trusted Root Certification Authorities” container: Reference 1, Reference 2
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