I have a potentially similar issue but the workaround to use refresh tokens isn’t viable as I also need to Use JWT
I suspect it has something to do with me setting a value for Override access token HTTP request body:
{
"grant_type": "client_credentials",
"client_assertion_type": "urn:ietf:params:oauth:client-assertion-type:jwt-bearer",
"client_assertion": {{{iClient.jwt.token}}}
}
Working version in Postman:
Debugging is challenging without seeing the auth step in Celigo.