When you purchase TOTP hardware tokens, they will arrive with seed data pre-programmed in to the token.
Before tokens are used with MFA services (such as Microsoft Entra), you will need to obtain the seed data (procedure below);
Once requested, the seed data will be sent to you in the form of a CSV file.
Open the file, then search for the Secret Key that matches the serial number of the token you are testing (Azure example below);
The seed data may be used to confirm the validity of the codes presented by the hardware tokens by using an online TOTP generator.