He's referring mostly to BankID which is a very secure MFA solution designed for banking purposes(all banks in Sweden accept the same mfa app) the inbox app is probably kivra, which is a email inbox which uses BankID for authentication, and is used for invoices and other "official business" mails.

There's also swish, which is instant payments to both friends and businesses. Swish also uses BankID.

BankID is also used to sign documents, file taxes, etc.etc.

Swedish society is largely built around this one official MFA solution, and having a phone where you cannot run it is a real hassle

You can't login to those without app as a 2FA.

The less free states are starting to require remote attestation to send payments at all.