Access tokens are an important part of granting access to a user. Access Tokens are part of the Auth2.0 standard. It is issued after successful login and contains information about the user's authorizations. Access token contains user information such as which groups the user belongs to, which roles the user has , the scopes of the user , user privileges, access rights and access permissions .
It is possible that if there is a problem with your Access Tokens you can be denied access. We have identified a scenario where your access has been denied and the following error messages are appearing.
In this particular scenario the access has been denied because the access tokens contained XML. The core of XML is in its name: Extensible Markup Language. XML is extensible. XML is a meta-language, a language that allows us to create or define other languages. It is widely used as a data conversion language. To compare with an example HTML is a simple predefined language, while XML is a standard language that defines other languages. So yes, when your tokens contain not simple language but meta-language it can sometimes lead to access being denied. In such instances access tokens are rendered invalid preventing you from access.
So please check that the access tokens do not contain XML and you are good to go!