Trying to set up OAuth2 with office 365. Once I save my settings I get the following error:
"URL error 60: SSL certificate problem: unable to get local issuer certificate (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://login.microsoftonline.com/common/oauth2/v2.0/token"
Seems like your local cURL cannot get the local issuer certificate for the login.microsoftonline.com domain. This can be due to many reasons so you'll need to do some googling.
Cheers.
Supplying a new cacert.pem file and pointing php.ini to use it, resolved this error.
Nice! Yea this is a weird issue; you'd think your install of cURL has the appropriate certificates but guess not 
Cheers.
Hi Guys,
Is possible to explain how do you fix this issue?
I'm using windows iis with osticket.
Visit the URL in the error and it should tell you possible resolutions. If all else fails do some googling!
Cheers.
Hi guys!
I have the same error : cURL error 60: SSL certificate problem: unable to get local issuer certificate (see https://curl.haxx.se/libcurl/c/libcurl-errors.html)
I have added the following to my php.ini file :
[curl]
; A default value for the CURLOPT_CAINFO option. This is required to be an
; absolute path.
;curl.cainfo = "C:\Program Files\iis express\PHP\v8.0\extras\ssl\cacert.pem"
and restarted IIS, but it still gives me the error
OK, so i forgot to uncomment it 
Now am getting this :
Unable to obtain Refresh Token
Then you are probably not configuring something correctly. Make sure you are using v1.17 and latest build of plugin and follow the steps exactly as they are in the official docs.
Cheers.
Hi all, KevinTheJedi you were correct! Fresh plugin version and it worked a treat. Thank you so much for everything!! 
