Entra Cloud Join, local access

Please let me know if I can word my query more efficiently. I'm having trouble finding a direct answer.

I'm recently helping with a migration, and devices are being cloud joined to entra to use HFB, etc.

On the new devices when I try to map an internal network share (non domain, also no azure connect) using local credentials the device prompt asks for email address and password.

I assumed I could just use "sign in with different credentials"

//serverip/share ./username password

The error states the network password is incorrect.

Do the people I'm helping actually not know their password, or am I overlooking a setting that prevents this from working during our transition period?

Same thing happens with a saved rdp shortcut. It asks for email and password and local credentials don't seem to work in the provided fields.

Thank you.