[2022] Cannot access Public Test after being accepted into last test.

This was unset as part of some past troubleshooting, which you alluded to.  I've give you back the relevant flag. If you run into problems with forum again, I recommend trying this to sort it out:

1) Log out of forum
2) Delete cookies related to warframe.com and invision.com
3) When returning to forum page, do a hard refresh (usually Ctrl+F5 in your browser) then enter your login details