React - Invalid OKTA JWT token

Hi, I’m new to Okta, my app has been wrapped with Okta and we are unable to get the access token in API end. Spent quite a lot of time, can someone please help.

We have React app with Okta, we don’t know how to validate that Okta is passing access token, also I understand this access token will be passed through cookies which are part of header and also these cannot to viewed on browser.

So what is the way to validate. When we check the logs from API, we don’t see any data specific to access token. Worth mentioning, sometimes we get “Invalid OKTA JWT token”, but this error disappears if we open portal in InCognito mode.