Please delete your login sessions and try to login again from version 1.6
You can download it from here. Not released yet. That’s why you have to manually download and install. It has the option to delete login sessions along with many other features.
https://downloads.www.ads-software.com/plugin/wp-instagram-post.1.6.zip
You can select option, save settings, deactivate the plugin, activate it again and all login sessions will be deleted.
And for ‘invalid request options’ you can get updates from https://www.ads-software.com/support/topic/invalid-request-options-2/
Regards
