Hi @richards1052, thanks for getting in touch. The site kit authentication proxy error can happen due to a number of reasons. You should see an additional message following this which should give some more insight into the cause of the issue such as “site not found” or “A site with the given URL already exists”. You can find all the variations here.
I’d suggest first trying a Site Kit reset. Once reset, go through the Site Kit setup once more and check if you encounter the same error message. If you do, please could you share the following:
- Your Site Health information. You can use this form to share privately if preferred.
- Since having Site Kit set up in the past, have you changed your site URL or wp-admin path?
- Do you encounter the same from an Incognito browser?
Once you’ve shared the above, I can help review and suggest some next steps to take if the reset doesn’t work. Let me know if you have any questions in the meantime.
