!!! Overview
[{$pagename}] is defined in [RFC 6749] as "The provided [authorization] grant (e.g., [authorization Code], [Resource Owner] [credentials]) or [Refresh Token] is invalid, expired, revoked, does not match the [redirection URI|redirect_uri] used in the [Authorization Request], or was issued to another [client|OAuth Client]."

Interestingly this is __NOT__ defined in the [OAuth Parameters Registry] ([OAuth Extensions Error Registry|https://www.iana.org/assignments/oauth-parameters/oauth-parameters.xhtml#extensions-error|target='_blank'])

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]