Unity updated the libCurl in version 2021.1.3f1. This results in a
Curl error 61: Unrecognized content encoding type. libcurl understands identity content encodings.
error for any use of the Playfab API. Updating the Playfab SDK did not solve the issue.
When using 2021.1.2, which does not have the libCurl update, I have no issues.