I have been getting the above error for several weeks now trying to add cross posting to Mastodon.
I don’t think this is an error on my end since I’ve been able to authenticate with many other apps/clients, but if anyone has any experience with this type of thing, could you provide any tips to get this fixed? Thanks in advance.
I’m getting this same error trying to connect to my Masto.host managed instance.
Likewise, I don’t have any other issues authenticating other services.
I think this happens when some authentication info with the Mastodon server is cached and has changed. I’ve reset it to your server in Micro.blog. Can you try again and let me know if it doesn’t work?
Thank you for the prompt response. That worked straight away this time 
