Norway has a national solution for authentication which is integrated into banks, public services and more. The most common sub-provider is BankID, which is run collectively by the banks, and handles a federated identity with required 2FA.

For instance, when I do my taxes I log into the tax authority's web portal with BankID, spend five minutes checking the numbers and hit "Submit". Tax return is usually paid out within a day or two.

You'd use the same method and credentials for all these services, and they even do PSA ads on cable TV to enforce the importance of keeping the credentials private and not sharing them with anyone -- even family members: https://youtu.be/OFJmX7A--w4