pfSense » pfSense Docs

Add the following note to:
https://docs.netgate.com/pfsense/en/latest/packages/freeradius.html#troubleshooting-radius-authentication

The radius client library used in pfSense software doesn't support RFC7499 (https://www.rfc-editor.org/rfc/rfc7499.html) hence RADIUS request/response payloads have an upper limit of 4096 bytes. Thus, there is a limit to the maximum number of attributes one can receive.

See:
https://redmine.pfsense.org/issues/12982#note-25