I would just like to add my voice to this question as I am having the same issue. I am also running the plugin in a multi-site environment, and the license is stored in the config file.
I have 4.21.1 and when trying to do the update to 4.23.1 through the dashboard, I get the same error message, and am forced to manually update.
Would appreciate any guidance you could provide with this. Thank you!
