PowerApps On-Prem SharePoint gateway problems with authentication

[csommerfield]

Hello everyone!

I've been encountering an issue with PowerApps and a SharePoint gateway for some time now and it's driving me nuts. 

When users are asked to authenticate, the click allow section when first time using the app, it's creating a connection but using their O365 credentials like "firstname.lastname@company.com" whereas the on prem site needs their domain\username in order to authenticate. 

I've instructed users to use domain\username but for some reason the connector in PowerApps keeps reverting it back to "firstname.lastname@company.com" as if it were o365 authentication. When it does that, the user cannot see any data in the PowerApps. 

Any ideas?

Thanks!

[csommerfield]

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