I had been using Tokodon for a few days, but suddenly this “invalid token” error appeared, which prevents me from accessing my Mastodon account.
I’ve already tried logging out and logging back in, but I’ve had no success. Uninstalling and reinstalling didn’t work either.
Had the same issue.
I uninstalled (flatpak) tokodon, removed user data (you can do that on the tokodon page on Discover when you uninstall it), removed the Tokodon folder inside of Kwalletmanager. Then I rebooted my computer (since Kwalletmanager didn’t want to disconnect Tokodon manually) and re-installed tokodon. Now it’s working just fine 
I have no clue why that works or why it doesn’t work in the first place, but that fixed it for me. 
