In the Access Token Debugger, the following error appears: 'Error validating access token: The session has been invalidated because the user changed their password or Facebook has changed the session for security reasons..'

I issued an API token that should be valid for long-term use. Issued: About 2 months ago Expiration: No expiration Data access expiration: 1 month later Validity: False

It turns out like this.

I am issuing access tokens in exactly the same way, but depending on the account that created the app, some tokens have no expiration, while others result in the above error in less than a month.

I have not changed the account password or anything like that.

Why is this happening?"

Let me know if you need further adjustments!