Explanation of how and why extra setup steps are needed to use {czso} on MacOS Monterey
Some early versions of MacOS Monterey ship with an old version of Libre SSL. This causes an otherwise rare bug where` the certificates on CZSO servers cannot be decrypted, so R cannot communicate with the server. Because R relies on the default system SSL library, this in fact affects even curl on the system command line.
The solution in R is to put
CURL_SSL_BACKEND=SecureTransport into .Renviron. (Don't forget to add a newline if this is the last line in the file).
Setting this anywhere after R startup may not work, hence the .Renviron solution is recommended.
You can also put this in your system environent e.g. by setting the system variable in the .profile file.
The issue no longer exists on MacOS Monterey 12.3 Beta, so presumably will also not exist on Monterey 12.3.