Facing Status Code 500

Facing an issue when we try to call: https://api.jublo.net/codebird/oauth2/token

Request URL: https://api.jublo.net/codebird/oauth2/token
Request Method: GET
Status Code: 500

I'm getting a CORS error : CORS policy: No 'Access-Control-Allow-Origin'
Did you change your CORS policy ? I've been using codebird for a while, that error appeared last week
Is this project still supported ?