I checked both URLs that pithos uses
https://tuner.pandora.com/services/json/?
https://internal-tuner.pandora.com/services/json/?
The error occurred during authentication.
The exception implies the validity start and end dates for the cert are outside of today.
I hit the site and both urls use the same pandora.com cert which has a date range of
Thu, 19 May 2022 00:00:00 GMT
Mon, 19 Jun 2023 23:59:59 GMT
Your log file indicates you have a date time stamp of 2022-06-29 17:35:37 which is a valid date based on the cert I found.
The CA cert dates are also valid and go from 2017-2027.
If you turn on debug, then the full url and POST data would also be provided. (but I would not post it since that would probably contain user and passwords.)
Only thing that comes to mind is to make sure you have the correct account set to be used in the settings. You could take the url, data and header and try to send a POST command to the website, but I have always found it difficult to send POST commands.