Auth problem with latest version (2.0.0.1)

I’d setup autopost-to-mastodon just a few weeks ago and all seemed to be going well although I’ve not had a chance to use it often yet. After updating to the latest version I am now receiving this error message when trying to authenticate from the “admin > settings > mastodon autopost settings” page:

“Client authentication failed due to unknown client, no client authentication included, or unsupported authentication method.”

This error message is appearing in a browser window for mastodon.games.ngo. I’ve logged out of mastodon and when presented with a login window have successfully logged into mastodon but still receive the above error message when attempting to authenticate this plugin.

The plugin page located at “admin > settings > mastodon autopost settings” seems to be working and after filling out the authentication info with the URL and clicking on “Login” provides a pop-up with “Enter the token from the popup:” but I’m unable to provide the token due to the error I’m receiving in the mastodon browser window.

Thank you for any assistance,
– Drew