In T11856#200111, @epriestley wrote:

Certificates have been deprecated in favor of tokens (they were less flexible, and users frequently found working with them confusing). Everything you describe is working as intended, so this is not a bug in Phabricator. We also don't provide support with third-party code.

If you're using a Zulip binding and its instructions tell you to generate a certificate, they are substantially out of date and won't work for a modern version of Phabricator. If you're using these bindings, they're haven't been updated in more than two years.

You should contact the extension maintainers, not us, for help with their extension or configuration instructions.

In T11856#200178, @mpries wrote:

Hi,

Everything you describe is working as intended, so this is not a bug in Phabricator.

For me it looks like conduit.getcertificate is not working as intended, otherwise it would return a certificate. The current API documentation still contains this method (and there is no notice, that this is deprecated or removed):
https://secure.phabricator.com/conduit/query/modern/

Where would I be able to see, that this call is not working anymore?

Thanks!