Settings page fail in Umbraco versions 7.7.1 and 7.6.4

[alvarobartra]

We have tried to configure the plugin in Umbraco version 7.7.1 and 7.6.4 and the settings screen does not show the "Authorize" buttons, in both cases we show what is attached in the attached image. Additionally we have done the configuration test in version 7.6.3 and it works perfectly.
You have some idea that you may be failing in these versions.
The plugin is pretty good.
Thanks for the reply