The deprecation warning on pages like e.g. https://tei-c.org/release/doc/tei-p5-doc/en/html/ref-name.html

targets http://www.tei-c.org/Activities/Council/Working/tcw27.xml which forwards (301) to http://teic.github.io/TCW/tcw27.html and finally results in a 404.

I found some references to this URL in common_tagdocs.xsl which could be fixed, see

but it maybe just some redirecting issue with the web server?