I concur with @22ozProphet, almost all Tor exit nodes seem to be blocked, independent of the browser used. However, after a little experimentation, nodes on a particular subnet seemed to be an exception. I was able to use grok.com with Tor Browser (see screenshot) by adding ExitNodes 185.220.101.128/25 to my torrc file.
This was a proof of concept, if for some reason you have no choice but to use Grok and it should be noted that your anonymity may be compromised by doing this. Any such configuration should be removed and Tor Browser restarted before navigating to any other sites, so as to restore Tor Browser’s default settings.
There seem to be other more privacy friendly alternatives if you don’t have to use grok.com.
