This question fits better in the Flow forum, but I can try to help anyway.
If I understand correctly, you can't connect to your last data connection.
Have you tried refreshing or clicking "crear" to create the Office 365 Users connection? You'll need to create it for each environment. You might also check the installation options in the top right dropdown menu to continue.
For the connection used, as Mr. Dang suggested, please take a try to create the related connection under PowerApps Home page, Data->Connections, add new connection, after that, check to see if the import could work as expected.
Community Support Team _ Michael Shao If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.